RFR: 8344105: Remove SecurityManager and related calls from jdk.attach and jdk.hotspot.agent [v2]

[Kevin Walls]

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

Kevin Walls has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge remote-tracking branch 'upstream/master' into 8344105_post_sm
 - Property fetch update
 - 8344105: Remove SecurityManager and related calls from jdk.attach and jdk.hotspot.agent

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22067/files
  - new: https://git.openjdk.org/jdk/pull/22067/files/3110091d..72b29b80

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22067&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22067&range=00-01

  Stats: 20872 lines in 657 files changed: 10218 ins; 7055 del; 3599 mod
  Patch: https://git.openjdk.org/jdk/pull/22067.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22067/head:pull/22067

PR: https://git.openjdk.org/jdk/pull/22067