ref: squash index_together operation into feedback initial migration

[asottile-sentry]

index_together is removed in django 5.1 so this is necessary to upgrade

we will need a hard stop for self-hosted

[asottile-sentry]

we will need a hard stop for self-hosted

What does this mean?

https://develop.sentry.dev/self-hosted/releases/#hard-stops

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #76506      +/-   ##
==========================================
- Coverage   79.96%   78.15%   -1.81%     
==========================================
  Files        7064     6894     -170     
  Lines      316313   306748    -9565     
  Branches    52794    52794              
==========================================
- Hits       252953   239752   -13201     
+ Misses      62922    60607    -2315     
- Partials      438     6389    +5951