RFR: 8369306: Implement invokeAndWait and finishTerminating on headless platform [v3]

[Kevin Rushforth]

On Fri, 10 Oct 2025 12:56:02 GMT, Jose Pereda <jpereda at openjdk.org> wrote:

>> This PR implements `invokeAndWait` and `finishTerminating` for the headless platform and includes two system tests, one for each, that fail before this PR, and pass after it.
>
> Jose Pereda has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Process feedback from reviewer

LGTM. The two new tests fail without the fix and pass with the fix.

Wait for 1 business day (so, Monday some time) to give others a change to review. In particular @johanvos might want to look at it.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1934#pullrequestreview-3323894035