RFR: 8278893: Parallel: Remove GCWorkerDelayMillis

[Thomas Schatzl]

Hi all,

  can I have reviews for this change that removes the unnecessary and unused flag develop `GCWorkerDelayMillis`?

Testing: local compilation, gha

Thanks,
  Thomas

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Commit messages:
 - Remove GCworkerdelaymillis

Changes: https://git.openjdk.java.net/jdk/pull/6862/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6862&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278893
  Stats: 21 lines in 3 files changed: 0 ins; 21 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6862.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6862/head:pull/6862

PR: https://git.openjdk.java.net/jdk/pull/6862