RFR: 8348423: [TestBug] stress test Nodes initialization from a background thread [v4]

[Andy Goryachev]

On Fri, 31 Jan 2025 23:28:09 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> Created a test that validates various Nodes can be initialized in a background thread.
>
> Andy Goryachev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   better name

Re: tooltip issue: I was able to modify the test to reproduce the issue reliably (thanks for earlier suggestion to create tooltips in a tight loop).

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PR Comment: https://git.openjdk.org/jfx/pull/1690#issuecomment-2631648326