<i18n dev> RFR: 8339803: Acknowledge case insensitive unambiguous keywords in tzdata files [v2]

[Naoto Sato]

> This is a follow on fix to [JDK-8339644](https://bugs.openjdk.org/browse/JDK-8339644). It turned out that TZ data files allow abbreviation of keywords, such as "ZO" for "Zone." Same fix, i.e, replacing `startsWith()` with `regionMatches()` was applied.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  tz files aligned with the default TzdbZoneRulesProvider list

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20940/files
  - new: https://git.openjdk.org/jdk/pull/20940/files/264d5772..423720c8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20940&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20940&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20940.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20940/head:pull/20940

PR: https://git.openjdk.org/jdk/pull/20940