<i18n dev> RFR: 8299571: ZoneRulesProvider.registerProvider() can leave inconsistent state on failure

[Naoto Sato]

Fixing the subject method to recover gracefully on a failed `ZoneRulesProvider` registration.

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Commit messages:
 - Added a test
 - 8299571: ZoneRulesProvider.registerProvider() can leave inconsistent state on failure

Changes: https://git.openjdk.org/jdk/pull/11928/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11928&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299571
  Stats: 99 lines in 2 files changed: 98 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/11928.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11928/head:pull/11928

PR: https://git.openjdk.org/jdk/pull/11928