RFR: 8353304: Open source two JTabbedPane tests [v2]

[Phil Race]

> Open source two Swing JTabbedPane tests.
> One is problem listed for macOS because of the way Aqua displays tabs on the left + right.

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8353304

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24461/files
  - new: https://git.openjdk.org/jdk/pull/24461/files/e7ff7b17..43e7670d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24461&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24461&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/24461.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24461/head:pull/24461

PR: https://git.openjdk.org/jdk/pull/24461