[jdk21u-dev] RFR: 8352682: Opensource JComponent tests

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle.

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Commit messages:
 - Backport 55afcb57a5d9dbc7bfad75e35df6b96932f6b074

Changes: https://git.openjdk.org/jdk21u-dev/pull/2472/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2472&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8352682
  Stats: 252 lines in 3 files changed: 252 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2472.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2472/head:pull/2472

PR: https://git.openjdk.org/jdk21u-dev/pull/2472