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

[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

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Commit messages:
 - Initial commit
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - Merge branch 'master' of github.com:DamonGuy/jdk
 - ... and 3 more: https://git.openjdk.org/jdk/compare/18dc186a...5e36f46c

Changes: https://git.openjdk.org/jdk/pull/27371/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27371&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8064922
  Stats: 49 lines in 2 files changed: 12 ins; 21 del; 16 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