Remove cd_auto_rollback feature flag

This commit cleans up the feature flag

config/feature_flags/development/cd_auto_rollback.yml

----
-name: cd_auto_rollback
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/45816
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/35404
-milestone: '13.6'
-type: development
-group: group::progressive delivery
-default_enabled: false

ee/app/controllers/ee/projects_controller.rb

@@ -95,7 +95,7 @@ module EE
 
       attrs += compliance_framework_params
 
-      if ::Gitlab::Ci::Features.auto_rollback_available?(project)
+      if project&.feature_available?(:auto_rollback)
         attrs << :auto_rollback_enabled
       end
 

ee/app/models/ee/project_ci_cd_setting.rb

@@ -25,7 +25,7 @@ module EE
     end
 
     def auto_rollback_enabled?
-      super && ::Gitlab::Ci::Features.auto_rollback_available?(project)
+      super && project.feature_available?(:auto_rollback)
     end
 
     private

ee/app/views/projects/settings/ci_cd/_auto_rollback.html.haml

-- if Gitlab::Ci::Features.auto_rollback_available?(@project)
+- if @project.feature_available?(:auto_rollback)
   %section.settings.no-animate#auto-rollback-settings{ class: ('expanded' if expanded) }
     .settings-header
       %h4

ee/spec/features/projects/settings/auto_rollback_spec.rb

@@ -28,34 +28,15 @@ RSpec.describe 'Automatic Deployment Rollbacks' do
     end
   end
 
-  context 'when cd_auto_rollback and auto_rollback are disabled' do
+  context 'when project does not have a license for auto_rollback feature' do
     before do
-      stub_feature_flags(cd_auto_rollback: false)
       stub_licensed_features(auto_rollback: false)
     end
 
     it_behaves_like 'the auto rollback feature is not available'
   end
 
-  context 'when cd_auto_rollback is disabled and auto_rollback is enabled' do
-    before do
-      stub_licensed_features(auto_rollback: true)
-      stub_feature_flags(cd_auto_rollback: false)
-    end
-
-    it_behaves_like 'the auto rollback feature is not available'
-  end
-
-  context 'when cd_auto_rollback is enabled and auto_rollback is disabled' do
-    before do
-      stub_feature_flags(cd_auto_rollback: true)
-      stub_licensed_features(auto_rollback: false)
-    end
-
-    it_behaves_like 'the auto rollback feature is not available'
-  end
-
-  context 'when cd_auto_rollback and auto_rollback are enabled' do
+  context 'when project has a license for auto_rollback feature' do
     before do
       stub_licensed_features(auto_rollback: true)
       project.add_maintainer(user)

ee/spec/models/ee/alert_management/alert_spec.rb

@@ -75,17 +75,5 @@ RSpec.describe EE::AlertManagement::Alert do
         subject
       end
     end
-
-    context 'when feature flag is disabled' do
-      before do
-        stub_feature_flags(cd_auto_rollback: false)
-      end
-
-      it 'does not execute AutoRollbackWorker' do
-        expect(Deployments::AutoRollbackWorker).not_to receive(:perform_async)
-
-        subject
-      end
-    end
   end
 end

ee/spec/models/project_ci_cd_setting_spec.rb

@@ -81,26 +81,25 @@ RSpec.describe ProjectCiCdSetting do
 
     let(:project) { create(:project) }
 
-    where(:license_feature, :feature_flag, :actual_setting) do
-      true  | true  | true
-      false | true  | true
-      true  | false | true
-      false | false | true
-      true  | true  | false
-      false | true  | false
-      true  | false | false
-      false | false | false
+    where(:license_feature, :actual_setting) do
+      true  | true
+      false | true
+      true  | true
+      false | true
+      true  | false
+      false | false
+      true  | false
+      false | false
     end
 
     with_them do
       before do
         stub_licensed_features(auto_rollback: license_feature)
-        stub_feature_flags(cd_auto_rollback: feature_flag)
         project.auto_rollback_enabled = actual_setting
       end
 
       it 'is only enabled if set and both the license and the feature flag allows' do
-        expect(project.auto_rollback_enabled?).to be(actual_setting && license_feature && feature_flag)
+        expect(project.auto_rollback_enabled?).to be(actual_setting && license_feature)
       end
     end
   end

lib/gitlab/ci/features.rb

@@ -55,10 +55,6 @@ module Gitlab
         ::Feature.enabled?(:ci_trace_log_invalid_chunks, project, type: :ops, default_enabled: false)
       end
 
-      def self.auto_rollback_available?(project)
-        ::Feature.enabled?(:cd_auto_rollback, project) && project&.feature_available?(:auto_rollback)
-      end
-
       def self.seed_block_run_before_workflow_rules_enabled?(project)
         ::Feature.enabled?(:ci_seed_block_run_before_workflow_rules, project, default_enabled: true)
       end