Revert CI FK validations
What does this MR do and why?
Reverts the CI Foreign Key validations added in !164294 (merged) and !164141 (merged), and the temporary FK added in !165488 (merged).
We think that there were issues during execution that resulted in a situation where the system triggers for the constraints were lost (#483290 (comment 2102934568)), so we are converting these migrations to no-ops so they do not impact self-managed instances.
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Related to #483290 (closed)
Edited by Matt Kasa