This is the native counterpart to the previous diff that handled the nested scroll in the message results modal on web. These changes will maintain the scrollable message in the toggle pin modal, but
show the message in full when navigating to see the pinned messages or search results.
The changes here also cover the issue where two pinned messages back to back would prevent the user from scrolling to see other messages [[
https://linear.app/comm/issue/ENG-4150/scrolling-issue-in-pinned-messages-message-search#comment-c020d958 | ENG-4150 ]].
Depends on D8259