[jdk21u-dev] RFR: 8353304: Open source two JTabbedPane tests

[Satyen Subramaniam]

Backporting JDK-8353304: Open source two JTabbedPane tests. Adds two JTabbedPane tests that are now opensourced by oracle. Ran GHA Sanity Checks, local Tier 1 and 2, and new tests directly. Patch is clean. Backporting for parity with Oracle.

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Commit messages:
 - Backport 1b6f6946ae1fa0657d6bd1f63b25a0008ab2acdd

Changes: https://git.openjdk.org/jdk21u-dev/pull/2101/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2101&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8353304
  Stats: 363 lines in 3 files changed: 363 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2101.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2101/head:pull/2101

PR: https://git.openjdk.org/jdk21u-dev/pull/2101