Remove push_rules_supersede_code_owners feature flag

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/262019

config/feature_flags/development/push_rules_supersede_code_owners.yml

----
-name: push_rules_supersede_code_owners
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/44126
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/262019
-type: development
-group: group::source code
-default_enabled: false

doc/user/project/code_owners.md

@@ -75,7 +75,6 @@ be used for merge request approvals:
 - As [merge request eligible approvers](merge_requests/merge_request_approvals.md#code-owners-as-eligible-approvers).
 - As required approvers for [protected branches](protected_branches.md#protected-branches-approval-by-code-owners). **(PREMIUM)**
 
-NOTE: **Note:**
 Developer or higher [permissions](../permissions.md) are required in order to
 approve a merge request.
 
@@ -93,12 +92,14 @@ to specify the actual owners and granular permissions.
 
 Using Code Owners in conjunction with [Protected Branches](protected_branches.md#protected-branches-approval-by-code-owners)
 will prevent any user who is not specified in the `CODEOWNERS` file from pushing
-changes for the specified files/paths, even if their role is included in the
+changes for the specified files/paths, except those included in the
 **Allowed to push** column. This allows for a more inclusive push strategy, as
 administrators don't have to restrict developers from pushing directly to the
 protected branch, but can restrict pushing to certain files where a review by
 Code Owners is required.
 
+[Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/35097) in [GitLab Premium](https://about.gitlab.com/pricing/) 13.5, users and groups who are allowed to push to protected branches do not require a merge request to merge their feature branches. Thus, they can skip merge request approval rules, Code Owners included.
+
 ## The syntax of Code Owners files
 
 Files can be specified using the same kind of patterns you would use

doc/user/project/protected_branches.md

@@ -185,6 +185,8 @@ When enabled, all merge requests targeting these branches will require approval
 by a Code Owner per matched rule before they can be merged.
 Additionally, direct pushes to the protected branch are denied if a rule is matched.
 
+[Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/35097) in [GitLab Premium](https://about.gitlab.com/pricing/) 13.5, users and groups who are allowed to push to protected branches do not require a merge request to merge their feature branches. Thus, they can skip merge request approval rules.
+
 ## Running pipelines on protected branches
 
 The permission to merge or push to protected branches is used to define if a user can

ee/changelogs/unreleased/remove_push_rules_supersede_code_owners_feature_flag.yml

+---
+title: Allow 'allowed_to_push' to supersede code owner protected branch
+merge_request: 45323
+author:
+type: changed

ee/lib/ee/gitlab/checks/diff_check.rb

@@ -20,8 +20,7 @@ module EE
         end
 
         def validate_code_owners?
-          return false if updated_from_web?
-          return false if ::Feature.enabled?(:push_rules_supersede_code_owners, project) && user_access.can_push_to_branch?(branch_name)
+          return false if updated_from_web? || user_access.can_push_to_branch?(branch_name)
 
           project.branch_requires_code_owner_approval?(branch_name)
         end

ee/spec/lib/gitlab/checks/diff_check_spec.rb

@@ -60,18 +60,6 @@ RSpec.describe Gitlab::Checks::DiffCheck do
         it 'returns false' do
           expect(validate_code_owners).to eq(false)
         end
-
-        context 'when push_rules_supersede_code_owners is disabled' do
-          before do
-            stub_feature_flags(push_rules_supersede_code_owners: false)
-          end
-
-          it 'returns branch_requires_code_owner_approval?' do
-            expect(project).to receive(:branch_requires_code_owner_approval?).and_return(true)
-
-            expect(validate_code_owners).to eq(true)
-          end
-        end
       end
     end