FF142 Relnote/Expr: Prioritized task scheduling API

[hamishwillee]

FF142 supports the Prioritized Task Scheduling AP in https://bugzilla.mozilla.org/show_bug.cgi?id=1966997

This adds a release note and removes the experimental features entry.

Related docs work can be tracked in #40484

[hamishwillee]

Note, these two are not supported, which is why I've explicitly listed out all the interfaces that are supported too.

[github-actions]

[mdn-linter] _{reported by reviewdog 🐶}

Suggested change

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Experimental_features
• /en-US/docs/Mozilla/Firefox/Releases/142

External URLs (70)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox

• https://bugzil.la/1057233 (1 time)
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• https://jpeg.org/jpegxl/ (1 time)
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• https://www.firefox.com/en-US/ (1 time)
• https://www.firefox.com/en-US/channel/desktop/ (3 times)
• https://www.firefox.com/en-US/channel/desktop/developer/ (2 times)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/142
Title: Firefox 142 for developers

• https://bugzil.la/1966997 (1 time) (Note! This may be a new URL 👀)