[jdk21u-dev] RFR: 8340193: Open source several AWT Dialog tests - Batch 1

[Goetz Lindenmaier]

I backport this for parity with 21.0.8-oracle

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Commit messages:
 - Backport 2d8fcc4271802b211c4718c6abae3ce9c99eafbd

Changes: https://git.openjdk.org/jdk21u-dev/pull/1654/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1654&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340193
  Stats: 668 lines in 11 files changed: 668 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1654.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1654/head:pull/1654

PR: https://git.openjdk.org/jdk21u-dev/pull/1654