Clarify requirements to post migration index creation
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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