Increase timeout for runaway regex test and reenable

Couldn't reproduce the flaky failure, but guessing that it's due to
hitting the optimizer timeout before getting to the regular expression
matching (e.g. gc in the test environment made things slow). Increasing
the analyzer timeout should make the test more reliable.

Fixes: #20764

presto-tests/src/main/java/com/facebook/presto/tests/AbstractTestDistributedQueries.java

@@ -373,12 +373,11 @@ public void testExplainAnalyzeDDL()
         computeActual("EXPLAIN ANALYZE DROP TABLE orders");
     }
 
-    // Flaky test: https://github.com/prestodb/presto/issues/20764
-    @Test(expectedExceptions = RuntimeException.class, expectedExceptionsMessageRegExp = "Regexp matching interrupted", timeOut = 30_000, enabled = false)
+    @Test(expectedExceptions = RuntimeException.class, expectedExceptionsMessageRegExp = "Regexp matching interrupted", timeOut = 30_000)
     public void testRunawayRegexAnalyzerTimeout()
     {
         Session session = Session.builder(getSession())
-                .setSystemProperty(SystemSessionProperties.QUERY_ANALYZER_TIMEOUT, "1s")
+                .setSystemProperty(SystemSessionProperties.QUERY_ANALYZER_TIMEOUT, "5s")
                 .build();
 
         computeActual(session, "select REGEXP_EXTRACT('runaway_regex-is-evaluated-infinitely - xxx\"}', '.*runaway_(.*?)+-+xxx.*')");