Ignore approvals_before_merge column

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• Close this issue

The approvals_before_merge field has been made redundant within:

• Issue: #11132 (closed).
• Merge request: !16121 (merged)

Within this issue we should:

• Make sure that approvals_before_merge replacement works properly and is not used in the database!
• Ignore the column, which is the first step of the 3-release approach of column removal