test: remove RegExpLikeUDFSuite due to shading boundary

The unit suite imports `org.apache.arrow.memory.RootAllocator` and
`org.apache.comet.CometArrowAllocator` from the spark module's test
sources, but at runtime the spark module loads the shaded
comet-common.jar from the local Maven repo. That JAR has
`package$.CometArrowAllocator()` returning the relocated
`org.apache.comet.shaded.arrow.memory.RootAllocator`, while the test
bytecode expects unshaded `org.apache.arrow.memory.RootAllocator`,
producing NoSuchMethodError. The earlier per-test RootAllocator
variant hit a different failure mode (Arrow leak detection).

End-to-end coverage of the JVM regex path is provided by
CometRegExpJvmSuite, which exercises Java-only constructs
(backreference, lookahead, lookbehind, embedded flags, named
groups), null handling, empty inputs, and multi-batch flows.

Author: andygrove

.github/workflows/pr_build_linux.yml

@@ -387,7 +387,6 @@ jobs:
               org.apache.comet.expressions.conditional.CometCoalesceSuite
               org.apache.comet.expressions.conditional.CometCaseWhenSuite
               org.apache.comet.CometRegExpJvmSuite
-              org.apache.comet.udf.RegExpLikeUDFSuite
           - name: "sql"
             value: |
               org.apache.spark.sql.CometToPrettyStringSuite

.github/workflows/pr_build_macos.yml

@@ -225,7 +225,6 @@ jobs:
               org.apache.comet.expressions.conditional.CometCoalesceSuite
               org.apache.comet.expressions.conditional.CometCaseWhenSuite
               org.apache.comet.CometRegExpJvmSuite
-              org.apache.comet.udf.RegExpLikeUDFSuite
           - name: "sql"
             value: |
               org.apache.spark.sql.CometToPrettyStringSuite