RFR: 8343891: Test javax/swing/JTabbedPane/TestJTabbedPaneBackgroundColor.java failed [v3]

[Abhishek Kumar]

> TestJTabbedPaneBackgroundColor.java test was failing intermittently in CI jobs. Test is modified to access UI components on EDT for stabilizations. CI testing seems fine after test change. Link attached in JBS.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Print expected and actual color on failure

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24148/files
  - new: https://git.openjdk.org/jdk/pull/24148/files/4331b211..23e50a99

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24148&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24148&range=01-02

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24148.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24148/head:pull/24148

PR: https://git.openjdk.org/jdk/pull/24148