[lworld] RFR: Merge jdk

[David Simms]

Merge jdk-27+4

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Commit messages:
 - Merge branch 'lworld' into lworld_merge_jdk_27_4
 - Adjust testing
 - Merge tag 'jdk-27+4' into lworld_merge_jdk_27_4
 - 8373833: "error.cert.not.found" and "error.explicit-sign-no-cert" errors duplicate each other
 - 8374308: ImageBufferCache has no effect and can be removed
 - 8373830: Refactor test/jdk/java/time/test tests to use JUnit over TestNG
 - 8374544: Add SleepyCat diagnostics for all platforms
 - 8374555: No need for visible input warning in s.s.u.Password when not reading from System.in
 - 8374190: Convert ConcurrentHashTable atomic lists to use Atomic<T>
 - 6562639: Wrong pixel bounds from TextLayout with white font
 - ... and 111 more: https://git.openjdk.org/valhalla/compare/a3e60b81...970129c8

The webrevs contain the adjustments done while merging with regards to each parent branch:
 - lworld: https://webrevs.openjdk.org/?repo=valhalla&pr=1928&range=00.0
 - jdk: https://webrevs.openjdk.org/?repo=valhalla&pr=1928&range=00.1

Changes: https://git.openjdk.org/valhalla/pull/1928/files
  Stats: 22912 lines in 2476 files changed: 5548 ins; 2614 del; 14750 mod
  Patch: https://git.openjdk.org/valhalla/pull/1928.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1928/head:pull/1928

PR: https://git.openjdk.org/valhalla/pull/1928