[SPARK-30534][INFRA] Use mvn in dev/scalastyle

### What changes were proposed in this pull request?

This PR aims to use `mvn` instead of `sbt` in `dev/scalastyle` to recover GitHub Action.

### Why are the changes needed?

As of now, Apache Spark sbt build is broken by the Maven Central repository policy.
https://stackoverflow.com/questions/59764749/requests-to-http-repo1-maven-org-maven2-return-a-501-https-required-status-an

> Effective January 15, 2020, The Central Maven Repository no longer supports insecure
> communication over plain HTTP and requires that all requests to the repository are
> encrypted over HTTPS.

We can reproduce this locally by the following.
```
$ rm -rf ~/.m2/repository/org/apache/apache/18/
$ build/sbt clean
```

And, in GitHub Action, `lint-scala` is the only one which is using `sbt`.

### Does this PR introduce any user-facing change?

No.

### How was this patch tested?

First of all, GitHub Action should be recovered.

Also, manually, do the following.

**Without Scalastyle violation**
```
$ dev/scalastyle
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=384m; support was removed in 8.0
Using `mvn` from path: /usr/local/bin/mvn
Scalastyle checks passed.
```

**With Scalastyle violation**
```
$ dev/scalastyle
OpenJDK 64-Bit Server VM warning: ignoring option MaxPermSize=384m; support was removed in 8.0
Using `mvn` from path: /usr/local/bin/mvn
Scalastyle checks failed at following occurrences:
error file=/Users/dongjoon/PRS/SPARK-HTTP-501/core/src/main/scala/org/apache/spark/SparkConf.scala message=There should be no empty line separating imports in the same group. line=22 column=0
error file=/Users/dongjoon/PRS/SPARK-HTTP-501/core/src/test/scala/org/apache/spark/resource/ResourceProfileSuite.scala message=There should be no empty line separating imports in the same group. line=22 column=0
```

Closes #27242 from dongjoon-hyun/SPARK-30534.

Authored-by: Dongjoon Hyun <dhyun@apple.com>
Signed-off-by: Dongjoon Hyun <dhyun@apple.com>

dev/scalastyle

@@ -17,18 +17,10 @@
 # limitations under the License.
 #
 
-SPARK_PROFILES=${1:-"-Pmesos -Pkubernetes -Pyarn -Pspark-ganglia-lgpl -Pkinesis-asl -Phive-thriftserver -Phive"}
+SCRIPT_DIR="$( cd "$( dirname "$0" )" && pwd )"
 
-# NOTE: echo "q" is needed because SBT prompts the user for input on encountering a build file
-# with failure (either resolution or compilation); the "q" makes SBT quit.
-ERRORS=$(echo -e "q\n" \
-    | build/sbt \
-        ${SPARK_PROFILES} \
-        -Pdocker-integration-tests \
-        -Pkubernetes-integration-tests \
-        scalastyle test:scalastyle \
-    | awk '{if($1~/error/)print}' \
-)
+SPARK_PROFILES=${1:-"-Pmesos -Pkubernetes -Pyarn -Pspark-ganglia-lgpl -Pkinesis-asl -Phive-thriftserver -Phive -Pdocker-integration-tests -Pkubernetes-integration-tests"}
+ERRORS=$($SCRIPT_DIR/../build/mvn $SPARK_PROFILES scalastyle:check | grep "^error file")
 
 if test ! -z "$ERRORS"; then
     echo -e "Scalastyle checks failed at following occurrences:\n$ERRORS"

pom.xml

@@ -2760,7 +2760,7 @@
         <configuration>
           <verbose>false</verbose>
           <failOnViolation>true</failOnViolation>
-          <includeTestSourceDirectory>false</includeTestSourceDirectory>
+          <includeTestSourceDirectory>true</includeTestSourceDirectory>
           <failOnWarning>false</failOnWarning>
           <sourceDirectory>${basedir}/src/main/scala</sourceDirectory>
           <testSourceDirectory>${basedir}/src/test/scala</testSourceDirectory>