Implement review comments from @dbalexandre.
1. Remove `master_or_greater?` and `developer_or_greater?` in favor of `max_member_access`, which is a lot nicer. 2. Remove a number of instances of `include Gitlab::Database::MigrationHelpers` in migrations that don't need this module. Also remove comments where not necessary. 3. Remove duplicate entry in CHANGELOG. 4. Move `ProtectedBranchAccessSelect` from Coffeescript to ES6. 5. Split the `set_access_levels!` method in two - one each for `merge` and `push` access levels.
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