Featured plugins can't change committers

[dd32]

In #5654 we limited the Featured/Beta plugins list to being unable to manage certain features.

This was intended as a security feature to limit the blast radius of compromised plugins.

However, ​the recent experiment of rotating new plugins into the featured category is creating some friction for authors, with many not understanding the reasoning.

Currently the plugins in Beta/Featured cannot:

• Close their plugin
• Toggle public preview
• Transfer their plugin
• Add/Remove committers

This is enforced by: ​https://github.com/WordPress/wordpress.org/blob/d02b657159750b03e2d89b8968a50f5ac75ca9c1/wordpress.org/public_html/wp-content/plugins/plugin-directory/class-capabilities.php#L92-L107

Let's:

• Expand the existing notice to be clearer that this is due to their plugin being listed in the XXXXXXX section
• Enable the Preview toggle
• Allow the management of committers

[dd32]

Originally I suggested limiting committers to just featured, but I think we should also enable it for Beta plugins now

## Summary

Addresses Meta Trac #8206.

• Committer management (add/remove): Now allowed for both Beta and Featured plugins (previously required reviewer).
• Public preview toggle: Now allowed for both Beta and Featured plugins (previously required reviewer).
• Close and transfer: Remain restricted to reviewers for security.
• Notice: Now explicitly tells authors which section (Beta/Featured) their plugin is in, and only mentions the actions that are actually restricted.

## Test plan

• [ ] Verify a Featured plugin author can add/remove committers
• [ ] Verify a Beta plugin author can add/remove committers
• [ ] Verify a Featured/Beta plugin author can toggle public preview
• [ ] Verify a Featured/Beta plugin author still cannot close or transfer
• [ ] Verify the notice displays the correct section name (Beta or Featured)
• [ ] Verify non-beta/non-featured plugins are unaffected

🤖 Generated with ​Claude Code

[dd32]

In 14718:

Plugin Directory: Allow Featured/Beta plugin owners to manage the committers and allow all committers to toggle public preview.

This relaxes a security change introduced with #5654, so adding/removing committers of these plugins now also triggers the plugins team to be CC'd for review.

Closes ​https://github.com/WordPress/wordpress.org/pull/561.
Fixes #8206.