RFR: 8367915: [TestBug] Add system property to ScreenCaptureTestWatcher

[Jayathirth D V]

On Wed, 17 Sep 2025 18:07:33 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

> Added `test.screenshot` system property to the `ScreenCaptureTestWatcher` to control writing of the screenshot data url to stderr.
> 
> Added corresponding gradle option `TEST_SCREENSHOT`.
> 
> The function is disabled by default for privacy reasons.

Marked as reviewed by jdv (Committer).

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PR Review: https://git.openjdk.org/jfx/pull/1910#pullrequestreview-3239932933