Specified why we need to test on staging (#23325)

In an engineering meeting on 4th December 2024 we discussed that
performance on our local machines is not comparable to a production
environment, the outcome of this meeting was an agreement that we would
test migrations on staging (or production-like environment) in order to
understand the performance qualities.

---------

Co-authored-by: Leif Singer <[email protected]>

Author: allouis

.github/workflows/migration-review.yml

@@ -30,7 +30,7 @@ jobs:
 
             ### General requirements
 
-            - [ ]  :warning: Tested on the staging database servers
+            - [ ]  :warning: Tested performance on staging database servers, as performance on local machines is not comparable to a production environment
             - [ ]  Satisfies idempotency requirement (both `up()` and `down()`)
             - [ ]  Does not reference models
             - [ ]  Filename is in the correct format (and correctly ordered)