bedo 00c9f36434 create stream: Bulk conversion of principals to UserProfiles. ...

Previously, this logic did the database queries to look up UserProfile
objects in a loop.

Fixes #21820.

Significantly improves Stream creation time and also unsusbcribing users.
Tested stream creation with 10k stream subscribers:

- before: 127 seconds ~2 mins
- after: 17 seconds ~0.3 min

Add a test case for user unsubscribing themself.

2024-08-16 17:46:19 -07:00

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