[jdk21u-dev] RFR: 8340279: Open source several AWT Dialog tests - Batch 2

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport e0dabfb4bfd93a4407518177043d3dbc85c4bbd9

Changes: https://git.openjdk.org/jdk21u-dev/pull/1610/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1610&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340279
  Stats: 542 lines in 12 files changed: 542 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1610.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1610/head:pull/1610

PR: https://git.openjdk.org/jdk21u-dev/pull/1610