[jdk21u-dev] RFR: 8315804: Open source several Swing JTabbedPane JTextArea JTextField tests

[Andrew Lu]

I backport this for parity with 21.0.5-oracle.

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Commit messages:
 - Backport 24c3d86f32a2e2d9cb24cd8827ef1f20bb53fead

Changes: https://git.openjdk.org/jdk21u-dev/pull/653/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=653&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315804
  Stats: 496 lines in 5 files changed: 496 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/653.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/653/head:pull/653

PR: https://git.openjdk.org/jdk21u-dev/pull/653