[Web API] Enable dom.events.asyncClipboard.clipboardItem by default

[dipikabh]

Acceptance criteria

• The listed features are documented sufficiently on MDN
• BCD is updated
• Interactive example and data repos are updated if appropriate
• The content has been reviewed as needed

For folks helping with Firefox related documentation

• Set bugs to dev-doc-complete
• Add entry to Firefox release notes for enabled/preview features
• Add/remove entry to Firefox experimental features page for preference/released features

Related Gecko bugs

Bug 1887845: Enabled dom.events.asyncClipboard.clipboardItem by default

Features to document

• It was enabled on Nightly in Firefox 122 (see doc issue).
• "Intent to ship"
  • Summary: Enable clipboard.read()/write() by default on all channels
  • Standard: https://w3c.github.io/clipboard-apis

Other

• Check content open issues to see if any pertain to the subject matter. If there are any that can be closed because of the work, do so. If there are any that can be fixed relatively quickly because of the knowledge from completing this issue and you have time, feel free to go ahead and fix them.

[hamishwillee]

Status

• BCD
  • FF125 Clipboard.readText supported browser-compat-data#23075
  • FF127 clipboard enabled browser-compat-data#23134
• Docs - look sufficient
• Release note FF127/125 Clipboard API release notes/expr feature #33577
• Experimental features FF127/125 Clipboard API release notes/expr feature #33577
• dev-docs-complete
  • FF125 updated in https://bugzilla.mozilla.org/show_bug.cgi?id=1877400#c8
  • FF127 Done