Log success state of mergeability checks
What does this MR do and why?
To help debug cases that may be related with mergeability checks, it'll be helpful to know if all checks are successful or not.
Example log field:
"mergeability.check_blocked_by_other_mrs_service.successful.values":[true]
Related to https://gitlab.com/gitlab-com/dev-sub-department/section-dev-request-for-help/-/issues/98#note_1422982195.
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.