RFR: 8343196: Add build property to identify experimental builds of JavaFX

[Ambarish Rapte]

On Thu, 14 Nov 2024 12:01:29 GMT, Ambarish Rapte <arapte at openjdk.org> wrote:

> Introduce a new build property `jfx.experimental.release.suffix` to be used for the early access builds of an under development feature in JavaFX.
> This property would be set to a value ONLY in a branch specific to an experiment in [jfx-sandbox](https://github.com/openjdk/jfx-sandbox) repo.
> For example:
> For the metal branch in jfx-sandbox repo, it would be set to `-metal`.  The javafx.version for the early access build generated from that branch would be `24-metal`.
> 
> And it would always be empty for master branch in both main jfx repo and in jfx-sandbox repo.
> This change has no effect on a regular developer build from master branch.

@kevinrushforth  Please take a look.

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PR Comment: https://git.openjdk.org/jfx/pull/1637#issuecomment-2476172646