[jdk23u] RFR: 8340073: Support "%z" time zone abbreviation format in TZ files

[Johny Jose]

Clean backport of https://git.openjdk.org/jdk/commit/418bb42b95b177f5f31f756054d0dd83740c6686

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Commit messages:
 - Backport 418bb42b95b177f5f31f756054d0dd83740c6686

Changes: https://git.openjdk.org/jdk23u/pull/158/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk23u&pr=158&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340073
  Stats: 19 lines in 2 files changed: 10 ins; 2 del; 7 mod
  Patch: https://git.openjdk.org/jdk23u/pull/158.diff
  Fetch: git fetch https://git.openjdk.org/jdk23u.git pull/158/head:pull/158

PR: https://git.openjdk.org/jdk23u/pull/158