RFR: 8343481: Remove unnecessary @SuppressWarnings annotations (kulla) [v2]

[Archie Cobbs]

> Please review this patch which removes unnecessary `@SuppressWarnings` annotations.

Archie Cobbs 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:

 - Remove two more "this-escape" supressions.
 - Merge branch 'master' into SuppressWarningsCleanup-kulla
 - Remove unnecessary @SuppressWarnings annotations.

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/21855/files
  - new: https://git.openjdk.org/jdk/pull/21855/files/cfba5912..af3b0477

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21855&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21855&range=00-01

  Stats: 2635 lines in 109 files changed: 1658 ins; 658 del; 319 mod
  Patch: https://git.openjdk.org/jdk/pull/21855.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21855/head:pull/21855

PR: https://git.openjdk.org/jdk/pull/21855