RFR: 8064922: [macos] Test javax/swing/JTabbedPane/4624207/bug4624207.java fails [v3]

[Damon Nguyen]

> When looking into this, it looks like macOS does not support mnemonics. It would therefore make sense to exclude macOS from this test as its main purpose is to test mnemonics on JTabbedPanes. Updated the test header to exclude macOS and test's keyPresses to remove the macOS specific inputs.
> 
> https://discussions.apple.com/thread/7983221?sortBy=rank

Damon Nguyen has updated the pull request incrementally with two additional commits since the last revision:

 - Merge branch '8064922/macMnemonics' of github.com:DamonGuy/jdk into 8064922/macMnemonics
 - Remove unnecessary tags

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Changes:
  - all: https://git.openjdk.org/jdk/pull/27371/files
  - new: https://git.openjdk.org/jdk/pull/27371/files/c940c6b0..c9d5c572

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=27371&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=27371&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/27371.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27371/head:pull/27371

PR: https://git.openjdk.org/jdk/pull/27371