RFR: 8360160: ubuntu-22-04 machine is failing client tests [v3]

[Alexander Zvegintsev]

On Thu, 11 Dec 2025 23:29:15 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

> I have switched to a single frame at a time 

This makes the test much slower. On my machine, the execution time is::
- ~33s with the one at a time version
- ~10s for version with all gcs in batches of 20 
 
Few notes on placing several frames:
<img width="1012" height="222" alt="image" src="https://github.com/user-attachments/assets/98820fd5-5c9e-4f9c-b2d4-a87681a56cb6" />
- If they are close enough, they can cast shadows on each other.
- If the auto-hide dock is disabled, the dock can overlap frames.  The dock auto-hide is enabled on the CI, but it would be better if it could be moved away from the screen border.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28646#discussion_r2613216465