Remove merge_request_approval_policies_inapplicable_rule_evaluation FF

Dominic Bauerrequested to merge
554581-ff-merge_request_approval_policies_inapplicable_rule_evaluation into master

What does this MR do and why?

Removes the merge_request_approval_policies_inapplicable_rule_evaluation feature flag introduced by !197162 (merged). The flag is globally enabled on GitLab.com.

Changelog: changed EE: true

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Related to #554581 (closed)

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