RFR: 8343478: Remove unnecessary @SuppressWarnings annotations (core-libs) [v7]

[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 pull request now contains 13 commits:

 - Remove more unnecessary @SuppressWarnings annotations.
 - Merge branch 'master' into SuppressWarningsCleanup-core-libs
 - Remove more unnecessary warning suppressions.
 - Merge branch 'master' into SuppressWarningsCleanup-core-libs
 - Put back @SuppressWarnings annotations to be fixed by JDK-8343286.
 - Merge branch 'master' into SuppressWarningsCleanup-core-libs
 - Update copyright years.
 - Remove a few more @SuppressWarnings annotations.
 - Remove a few more @SuppressWarnings annotations.
 - Update copyright years.
 - ... and 3 more: https://git.openjdk.org/jdk/compare/81e43114...1905d6e3

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Changes: https://git.openjdk.org/jdk/pull/21852/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21852&range=06
  Stats: 197 lines in 100 files changed: 0 ins; 104 del; 93 mod
  Patch: https://git.openjdk.org/jdk/pull/21852.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21852/head:pull/21852

PR: https://git.openjdk.org/jdk/pull/21852