[jdk21u-dev] RFR: 8328402: Implement pausing functionality for the PassFailJFrame

[Goetz Lindenmaier]

I backport this for parity with 21.0.6-oracle.

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Commit messages:
 - Backport 581b1e29aebd425bade14d2ee46704a16187df5b

Changes: https://git.openjdk.org/jdk21u-dev/pull/1070/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1070&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328402
  Stats: 47 lines in 1 file changed: 35 ins; 2 del; 10 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1070.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1070/head:pull/1070

PR: https://git.openjdk.org/jdk21u-dev/pull/1070