<i18n dev> RFR: 8343476: Remove unnecessary @SuppressWarnings annotations (client)

[Archie Cobbs]

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

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Commit messages:
 - Remove unnecessary @SuppressWarnings annotations.

Changes: https://git.openjdk.org/jdk/pull/21850/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21850&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343476
  Stats: 156 lines in 101 files changed: 0 ins; 150 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/21850.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21850/head:pull/21850

PR: https://git.openjdk.org/jdk/pull/21850