[jdk8u] RFR: 8347965: (tz) Update Timezone Data to 2025a

[Dmitry Cherepanov]

Backport of tzdata2025a

- generated rearguard version using the steps `cd tzdb-2025a && make rearguard_tarballs` and applied the rearguard version to make/jdk & jdk/test
- test changes from 11u patch applied cleanly

Testing: all relevant tests passed (jdk/test/java/time jdk/test/java/text/Format jdk/test/java/util/TimeZone jdk/test/sun/util/calendar jdk/test/sun/util/resources)

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Commit messages:
 - Backport bbe28d927803d0c9286cdb1494afa9a267463dd4

Changes: https://git.openjdk.org/jdk8u/pull/70/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u&pr=70&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8347965
  Stats: 494 lines in 22 files changed: 300 ins; 103 del; 91 mod
  Patch: https://git.openjdk.org/jdk8u/pull/70.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u.git pull/70/head:pull/70

PR: https://git.openjdk.org/jdk8u/pull/70