RFR: 8306858: Remove some renmants of CMS from SA agent

[Thomas Schatzl]

Hi all,

  please review this change that removes some remaining CMS related stuff.

Testing: tier1-3, gha

Thanks,
  Thomas

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Commit messages:
 - Remove CMS stuff

Changes: https://git.openjdk.org/jdk/pull/13646/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13646&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306858
  Stats: 13 lines in 4 files changed: 0 ins; 12 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13646.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13646/head:pull/13646

PR: https://git.openjdk.org/jdk/pull/13646