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Clarify requirements to post migration index creation

Pavel Shutsin requested to merge clarify-db-post-migration-timings into master

What does this MR do and why?

This came up from !103434 (comment 1185254895) While we require migrations to be under 5minutes each, concurrent commands in a post migration can be executed for longer. Here we clarify that.

Follow-up adjustments to https://gitlab.com/gitlab-org/database-team/gitlab-com-database-testing might be required to warn developers with new threshold for post migration.

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