[Metal] Temporarily switch default Rendering Pipeline to Metal on MacOS

[Ambarish Rapte]

Hello OpenJFX-dev

On macOS, the default JavaFX rendering pipeline is temporarily switched to Metal.
This change will remain in effect for the next 7 weeks, until October 8, 2025.

This change is included in JavaFX-26 EA build 5 and onwards.
The JavaFX-26 EA build 5 is now available for download here: https://jdk.java.net/javafx26/

Intention of this change is to expose the Metal rendering pipeline for broader testing.
Please share your feedback by:
- Sending an email to openjfx-dev at openjdk.org or
- Reporting issues via JBS (https://bugs.openjdk.org/) or at https://bugreport.java.com

If needed, one can revert to the es2 pipeline by adding -Dprism.order=es2 option to the Java command.

Regards,
Ambarish
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