[external tests]: Converge the testcases require different test suites based on different impl or jdk version

Recent update of external test export impl and jdk_version as environment variables when generating the docker files. Also external tests have been updated to support test suites options as the docker CMD. Based on that there is no need to duplicate the test case in playlist.xml if different impl or jdk version works with different test suites.

For example project elasticsearch have three test cases elasticsearch_test_openj9_jdk8, elasticsearch_test_openj9_latest, elasticsearch_test_hotspot. The only difference between those test cases are the exclude-task based on impl and jdk_version. We can actually converge those three cases to just one by setting the exclude-task in test.sh. Similar to quakus_quickstarts/test.sh.

This issue is to find all similar cases in all external projects and update corresponding test.sh and playlist.xml.

Review the external projects' playlist.xml and test.sh files, using elasticsearch and quakus_quickstarts/test.sh as the named examples. Find test cases duplicated only for impl or jdk_version, then verify that each project can select the appropriate test suite through test.sh. Done means the duplicate playlist entries are consolidated without losing the version-specific exclusions.

Written by the indexing model from the issue text.