RFR: 8316274: javax/swing/ButtonGroup/TestButtonGroupFocusTraversal.java fails in Ubuntu 23.10 with Motif LAF

[Alexander Zvegintsev]

The test began to fail in Ubuntu 23.10. While investigating, I found and filed two new issues:

* https://bugs.openjdk.org/browse/JDK-8370624 JToggleButton does not display caption if setAction is called
 e.g. setAction vs addActionListener 
<img width="287" height="86" alt="image" src="https://github.com/user-attachments/assets/28d24449-e5aa-41fb-a5f1-470ab11d6899" /> vs <img width="287" height="86" alt="image" src="https://github.com/user-attachments/assets/04cdd4ed-6ea4-403c-86c3-f60971d16007" />
* https://bugs.openjdk.org/browse/JDK-8370627 motif look and feel focus traversal order may vary depending on the system version


This test fix changes `setAction` to  `addActionListener` and it is to avoid problemlisting the test on Linux.

Testing looks good.

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Commit messages:
 - 8316274: javax/swing/ButtonGroup/TestButtonGroupFocusTraversal.java fails in Ubuntu 23.10 with Motif LAF

Changes: https://git.openjdk.org/jdk/pull/27979/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27979&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8316274
  Stats: 31 lines in 1 file changed: 0 ins; 24 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/27979.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27979/head:pull/27979

PR: https://git.openjdk.org/jdk/pull/27979