[lib] Allow reacting and creating sidebars from failed messages in thick threads

Summary: https://linear.app/comm/issue/ENG-9313/consider-allowing-creating-sidebars-from-messages-that-failed#comment-dc22d82f

Test Plan: Checked on native and web if the actions are present for failed messages in thick threads and aren't present for failed messages in thin threads.

Reviewers: kamil, will

Reviewed By: will

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D13362