Draft: Add `commit_message_negative_regex` field when it is missing
What does this MR do and why?
Contributes to #426066 (closed)
Problem
Some GitLab instances are missing a 'commit_message_negative_regex' field. It leads to migration failures.
Solution
Create migration to add the missing field if necessary.
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.