[lib] Set failedQueryCacheTimeout to 0 in UserIdentityCache

Summary: This addresses ENG-9255, and makes it so if a user identity fetch times out, the next time it's requested, we don't return null from the cache, but instead retry the fetch.

Test Plan: I set queryTimeout to 1 second, which made it time out. I confirmed in the logs that after the timeout, a second request was dispatched

Reviewers: varun, will

Reviewed By: varun

Subscribers: tomek

Differential Revision: https://phab.comm.dev/D13299