Fail fast if JCK_GIT_REPO and JDK_VERSION has a mismatch

While there is no guarantee that everyone using our scripts use the recommended name, JCKxx-unzipped for JCK_GIT_REPO, but if they do, we can add a check for whether the version in use matches the JDK_VERSION under test. This was identified as a common user error for some people when running Grinders (who are not launching Grinders from the quick links provided in the original test job) during the retrospective.

If there is a mismatch, we should fail immediately instead of trying to run tests.

Start by locating the Grinder scripts that read JCK_GIT_REPO and JDK_VERSION, then trace where test execution begins. Verify the expected JCKxx-unzipped naming case and add a check or test showing that a version mismatch stops execution before tests run.

Written by the indexing model from the issue text.