RFR: 8169285: Re-enable javafx.swt tests [v3]

[Andy Goryachev]

On Mon, 28 Apr 2025 09:38:06 GMT, Marius Hanl <mhanl at openjdk.org> wrote:

>> With this change, you can now run the `swt` tests as easy as: `:swt:test -PSWT_TEST=true`.
>> ![image](https://github.com/user-attachments/assets/928141b5-ac81-4b15-9d86-5ea87f47c1c4)
>> 
>> Note: At one point `IS_FULL_TEST` was used as well for the enablement of the tests. I don't see any reason for it, and one flag seems to be enough to me. But open for opinions on this one.
>
> Marius Hanl has updated the pull request incrementally with one additional commit since the last revision:
> 
>   SWT_TEST default is false on MacOS

- is this PR description still valid?
- there seems to be two GHA failures, are these intermittent or a result of the changes in this PR?

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PR Comment: https://git.openjdk.org/jfx/pull/1783#issuecomment-2842317701