Integration test compile with Java 8 and run with Java 8 and Java 11

[maytasm]

Integration test compile with Java 8 and run with Java 8 and 11

Removed integration tests compiling with Java 11 as we have no plan to release Druid compiling with Java 11. Added integration test for compiling with Java 8 and running with Java 11 in addition to existing integration tests that compile with Java 8 and run with Java 8.

This PR has:

• been self-reviewed.
  • using the concurrency checklist (Remove this item if the PR doesn't have any relation to concurrency.)
• added documentation for new or modified features or behaviors.
• added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
• added or updated version, license, or notice information in licenses.yaml
• added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
• added unit tests or modified existing tests to cover new code paths.
• added integration tests.
• been tested in a test Druid cluster.