[native] Fix reply not working in search results

Summary:
issue: https://linear.app/comm/issue/ENG-3881/reply-doesnt-work-in-search-screen-and-in-pinned-messages-screen
Reply from within the search screen didn't work. We need to navigate back to the thread to be able to reply.
Adding MessageSearchRouteName to threadRoutes is necessary, because we don't want chat input bar to remove its listener for input state events, which happens if activeThreadSelector returns null or an id of a different thread (see isActive variable in chat-input-bar.react.js). activeThreadSelector returns null if threadRoutes doesn't contain the current route name.
ThreadSettingsRouteName is also in threadRoutes, and the search screen is used in a similar fashion to thread settings screen.

Test Plan: Pressed "reply" on the search screen. Checked that the correct thread was opened and the input bar message was prepended with the reply.

Reviewers: kamil, kuba, bartek, ashoat

Reviewed By: ashoat

Subscribers: tomek, atul

Differential Revision: https://phab.comm.dev/D7942