RFR: Merge openjdk/jdk21u:master

[William Kemper]

Merges tag jdk-21.0.10+4

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Commit messages:
 - 8366893: java/lang/Thread/virtual/stress/GetStackTraceALotWhenPinned.java timed out on macos-aarch64
 - 8351110: ImageIO.write for JPEG can write corrupt JPEG for certain thumbnail dimensions
 - 8352682: Opensource JComponent tests
 - 8370465: Right to Left Orientation Issues with MenuItem Component
 - 8368668: Several vmTestbase/vm/gc/compact tests timed out on large memory machine
 - 8280482: Window transparency bug on Linux

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/shenandoah-jdk21u/pull/229/files
  Stats: 632 lines in 23 files changed: 598 ins; 0 del; 34 mod
  Patch: https://git.openjdk.org/shenandoah-jdk21u/pull/229.diff
  Fetch: git fetch https://git.openjdk.org/shenandoah-jdk21u.git pull/229/head:pull/229

PR: https://git.openjdk.org/shenandoah-jdk21u/pull/229