Run migration tasks against both dbs
What does this MR do and why?
Resolves #386436
This drops :main
from the migration tasks we run in CI for all EE jobs and adds gitlab:db:lock_writes
before migrating.
Tested in db:check-schema and db:check-schema-single-db from !108151 (closed)
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Alex Ives