[jdk21u-dev] RFR: Merge jdk21u:master

[Goetz Lindenmaier]

Merge build tag 21.0.7-ga from jdk21u to jdk21u-dev

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Commit messages:
 - Merge
 - 8353904: [21u] Remove designator DEFAULT_PROMOTED_VERSION_PRE=ea for release 21.0.7
 - 8331735: UpcallLinker::on_exit races with GC when copying frame anchor
 - 8339810: Clean up the code in sun.tools.jar.Main to properly close resources and use ZipFile during extract
 - 8309841: Jarsigner should print a warning if an entry is removed
 - 8347847: Enhance jar file support
 - 8343007: Enhance Buffered Image handling
 - 8342562: Enhance Deflater operations
 - 8338430: Improve compiler transformations
 - 8337692: Better TLS connection support
 - ... and 1 more: https://git.openjdk.org/jdk21u-dev/compare/e13da984...03cad37d

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

Changes: https://git.openjdk.org/jdk21u-dev/pull/1658/files
  Stats: 305 lines in 11 files changed: 227 ins; 25 del; 53 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1658.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1658/head:pull/1658

PR: https://git.openjdk.org/jdk21u-dev/pull/1658