[lib] Increase timeout for leave_thread
Summary: Noticed that my test user's web client timed out when leaving the Comm community. I think we should increase the timeout here to match the other uses of permissionsAndAuthRelatedRequestTimeout.
Test Plan:
- Flow
- I compared these lines with other ones in the same file (eg. changeThreadMemberRoles) and concluded they were safe
Reviewers: tomek
Reviewed By: tomek
Differential Revision: https://phab.comm.dev/D12990