jmx-dev RFR: 8343483: Remove unnecessary @SuppressWarnings annotations (serviceability) [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 four additional commits since the last revision:

 - Update copyright years.
 - Merge branch 'master' into SuppressWarningsCleanup-serviceability
 - Merge branch 'master' into SuppressWarningsCleanup-serviceability
 - Remove unnecessary @SuppressWarnings annotations.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/21857/files
  - new: https://git.openjdk.org/jdk/pull/21857/files/4de38fe6..a8e438be

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21857&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21857&range=00-01

  Stats: 3237 lines in 135 files changed: 2078 ins; 749 del; 410 mod
  Patch: https://git.openjdk.org/jdk/pull/21857.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21857/head:pull/21857

PR: https://git.openjdk.org/jdk/pull/21857