Implement final review comments from @rymai.
1. Instantiate `ProtectedBranchesAccessSelect` from `dispatcher` 2. Use `can?(user, ...)` instead of `user.can?(...)` 3. Add `DOWNTIME` notes to all migrations added in !5081. 4. Add an explicit `down` method for migrations removing the `developers_can_push` and `developers_can_merge` columns, ensuring that the columns created (on rollback) have the appropriate defaults. 5. Remove duplicate CHANGELOG entries. 6. Blank lines after guard clauses.
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