chore: Update MR Revert template to reference migration rollbacks
What does this MR do and why?
The existing Revert MR template could use a pointer to our migration rollback docs to make the action more clear when a revert MR requires DB changes
See gitlab-com/gl-infra/production#8436 (comment 1291540166)
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.