[lib/native/web] Enable option to save notif tab of child threads irregardless of parent setting or sidebar type on web and native

Summary:
This allows sidebars to be moved to separate tabs from their parents. Radio buttons are enabled irregardless of sidebar type. Save buttons are enabled even if parents are muted

Notice texts are also removed

Depends on D13719

Test Plan: Tested on both web and native (iOS simulator), ensuring that child threads could be moved separate from their parents by selecting the mute/home radio buttons and clicking save

Reviewers: ashoat, varun

Reviewed By: ashoat

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13721