RFR: 8323508: Remove TestGCLockerWithShenandoah.java line from TEST.groups

[Stefan Karlsson]

TestGCLockerWithShenandoah.java was recently removed, but the TEST.groups file still has a reference to it. This causes problems in our CI pipeline.

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Commit messages:
 - Revert unrelated changes
 - 8323508: Remove TestGCLockerWithShenandoah.java line from TEST.groups

Changes: https://git.openjdk.org/jdk/pull/17344/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17344&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8323508
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/17344.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17344/head:pull/17344

PR: https://git.openjdk.org/jdk/pull/17344