Draft: Drop columns for encrypted ai secrets
What does this MR do and why?
In this MR we're removing the unused columns per https://docs.gitlab.com/ee/development/database/avoiding_downtime_in_migrations.html#dropping-columns
Currently, we're at Step 2.
Remove the unused columns for the ai legacy secrets Refers to #466161 (closed)
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Edited by Bojan Marjanovic