[web][native] Simplify exceptions handling when sending text message
Summary: In D1141 we simplified createRealizedThread functions to be only try-finally. These were used only in sendTextMessage functions and can be simplified to just adding finally to existing try-catch blocks.
Test Plan: Flow, tested with other diffs
Reviewers: ashoat
Reviewed By: ashoat
Subscribers: KatPo, Adrian, atul
Differential Revision: https://phabricator.ashoat.com/D1142