[fix](routine load) fix show routine load task result incorrect (#38523)

Create a job:
```
CREATE ROUTINE LOAD testShow ON test_show_routine_load
COLUMNS TERMINATED BY ","
PROPERTIES
(
"max_batch_interval" = "5",
"max_batch_rows" = "300000",
"max_batch_size" = "209715200"
)
FROM KAFKA
(
"kafka_broker_list" = "127.0.0.1:19092",
"kafka_topic" = "test_show_routine_load",
"property.kafka_default_offsets" = "OFFSET_BEGINNING"
);
```
show routine load task:
```
SHOW ROUTINE LOAD TASK WHERE JobName = "testShow";
```
result:
```
ERROR 1105 (HY000): errCode = 2, detailMessage = The job named testshowdoes not exists or job state is stopped or cancelled
```

Do not  use `toLowerCase` method;

fe/fe-core/src/main/java/org/apache/doris/analysis/ShowRoutineLoadTaskStmt.java

@@ -121,7 +121,7 @@ private void checkJobNameExpr(Analyzer analyzer) throws AnalysisException {
                 break CHECK;
             }
             StringLiteral stringLiteral = (StringLiteral) binaryPredicate.getChild(1);
-            jobName = stringLiteral.getValue().toLowerCase();
+            jobName = stringLiteral.getValue();
         } // CHECKSTYLE IGNORE THIS LINE
 
         if (!valid) {

regression-test/suites/load_p0/routine_load/data/test_show_routine_load.csv

@@ -0,0 +1 @@
+1,eab,2023-07-15,def,2023-07-20:05:48:31,"ghi"

regression-test/suites/load_p0/routine_load/test_show_routine_load.groovy

@@ -0,0 +1,150 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+import org.apache.kafka.clients.admin.AdminClient
+import org.apache.kafka.clients.producer.KafkaProducer
+import org.apache.kafka.clients.producer.ProducerRecord
+import org.apache.kafka.clients.producer.ProducerConfig
+
+suite("test_show_routine_load","p0") {
+    def kafkaCsvTpoics = [
+                  "test_show_routine_load",
+                ]
+    String enabled = context.config.otherConfigs.get("enableKafkaTest")
+    String kafka_port = context.config.otherConfigs.get("kafka_port")
+    String externalEnvIp = context.config.otherConfigs.get("externalEnvIp")
+    def kafka_broker = "${externalEnvIp}:${kafka_port}"
+    if (enabled != null && enabled.equalsIgnoreCase("true")) {
+        // define kafka 
+        def props = new Properties()
+        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "${kafka_broker}".toString())
+        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer")
+        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringSerializer")
+        // Create kafka producer
+        def producer = new KafkaProducer<>(props)
+
+        for (String kafkaCsvTopic in kafkaCsvTpoics) {
+            def txt = new File("""${context.file.parent}/data/${kafkaCsvTopic}.csv""").text
+            def lines = txt.readLines()
+            lines.each { line ->
+                logger.info("=====${line}========")
+                def record = new ProducerRecord<>(kafkaCsvTopic, null, line)
+                producer.send(record)
+            }
+        }
+    }
+
+    if (enabled != null && enabled.equalsIgnoreCase("true")) {
+        def tableName = "test_show_routine_load"
+        sql """ DROP TABLE IF EXISTS ${tableName} """
+        sql """
+            CREATE TABLE IF NOT EXISTS ${tableName} (
+                `k1` int(20) NULL,
+                `k2` string NULL,
+                `v1` date  NULL,
+                `v2` string  NULL,
+                `v3` datetime  NULL,
+                `v4` string  NULL
+            ) ENGINE=OLAP
+            DUPLICATE KEY(`k1`)
+            COMMENT 'OLAP'
+            DISTRIBUTED BY HASH(`k1`) BUCKETS 3
+            PROPERTIES ("replication_allocation" = "tag.location.default: 1");
+        """
+
+        try {
+            sql """
+                CREATE ROUTINE LOAD testShow ON ${tableName}
+                COLUMNS TERMINATED BY ","
+                PROPERTIES
+                (
+                    "max_batch_interval" = "5",
+                    "max_batch_rows" = "300000",
+                    "max_batch_size" = "209715200"
+                )
+                FROM KAFKA
+                (
+                    "kafka_broker_list" = "${externalEnvIp}:${kafka_port}",
+                    "kafka_topic" = "${kafkaCsvTpoics[0]}",
+                    "property.kafka_default_offsets" = "OFFSET_BEGINNING"
+                );
+            """
+
+            sql """
+                CREATE ROUTINE LOAD testShow1 ON ${tableName}
+                COLUMNS TERMINATED BY ","
+                PROPERTIES
+                (
+                    "max_batch_interval" = "5",
+                    "max_batch_rows" = "300000",
+                    "max_batch_size" = "209715200"
+                )
+                FROM KAFKA
+                (
+                    "kafka_broker_list" = "${externalEnvIp}:${kafka_port}",
+                    "kafka_topic" = "${kafkaCsvTpoics[0]}",
+                    "property.kafka_default_offsets" = "OFFSET_BEGINNING"
+                );
+            """
+            sql "sync"
+
+            String db = context.config.getDbNameByFile(context.file)
+            log.info("reason of state changed: ${db}".toString())
+
+            def res = sql "show routine load for ${db}.testShow"
+            log.info("reason of state changed: ${res.size()}".toString())
+            assertTrue(res.size() == 1)
+
+            res = sql "show routine load for testShow"
+            log.info("reason of state changed: ${res.size()}".toString())
+            assertTrue(res.size() == 1)
+
+            res = sql "show all routine load"
+            log.info("reason of state changed: ${res.size()}".toString())
+            assertTrue(res.size() > 1)
+
+            res = sql "SHOW ROUTINE LOAD LIKE \"%testShow%\""
+            log.info("reason of state changed: ${res.size()}".toString())
+            assertTrue(res.size() == 2)
+
+            def count = 0
+            while (true) {
+                res = sql "select count(*) from ${tableName}"
+                def state = sql "show routine load for testShow1"
+                log.info("routine load state: ${state[0][8].toString()}".toString())
+                log.info("routine load statistic: ${state[0][14].toString()}".toString())
+                log.info("reason of state changed: ${state[0][17].toString()}".toString())
+                if (res[0][0] > 0) {
+                    break
+                }
+                if (count >= 120) {
+                    log.error("routine load can not visible for long time")
+                    assertEquals(20, res[0][0])
+                    break
+                }
+                sleep(5000)
+                count++
+            }
+            res = sql "SHOW ROUTINE LOAD TASK WHERE JobName = \"testShow1\";"
+            log.info("SHOW ROUTINE LOAD task result: ${res}".toString())
+            assertTrue(res.size() == 1)
+        } finally {
+            sql "stop routine load for testShow"
+            sql "stop routine load for testShow1"
+        }
+    }
+}