RFR: 8334493: Remove SecurityManager Permissions infrastructure from DiagnosticCommands

[Kevin Walls]

Remove redundant SecurityManager Permission  references
(following on from JDK-8338411: Implement JEP 486: Permanently Disable the Security Manager).

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Commit messages:
 - 8334493: Remove SecurityManager Permissions infrastructure from DiagnosticCommands

Changes: https://git.openjdk.org/jdk/pull/22315/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22315&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8334493
  Stats: 402 lines in 17 files changed: 0 ins; 386 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/22315.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22315/head:pull/22315

PR: https://git.openjdk.org/jdk/pull/22315