Agniva De Sarker 6898b3d70f Optimize TeamsUnread (#19507) ...

The GetTeamsUnreadForUser call would be called for every team switch.
In CRT mode, it would make a separate store call for every team, which
would run the 3 aggregate SQL queries in GetThreadsForUser.

This is suboptimal because the complexity is linearly proportional
to the number of teams.

We make the following optimizations:
1. Change the query to a single one which aggregates all teams.
2. The query originally used just 2 out of the 3 queries, so one
query was fully redundant. We remove that query in the new one.
3. Further analysis was done whether it makes sense to run the 2
queries synchronously or not. The load-tests didn't show any degradation
in running them concurrently, so we keep the same behavior.

```release-note
NONE
```

2022-02-17 09:24:39 +05:30

310 KiB

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