Remove import_requirements_csv flag

- This FF is no longer needed

config/feature_flags/development/import_requirements_csv.yml

----
-name: import_requirements_csv
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48060
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/284846
-milestone: '13.7'
-type: development
-group: group::product planning
-default_enabled: true

ee/app/controllers/projects/requirements_management/requirements_controller.rb

@@ -7,9 +7,6 @@ class Projects::RequirementsManagement::RequirementsController < Projects::Appli
 
   before_action :authorize_read_requirement!
   before_action :authorize_import_access!, only: [:import_csv, :authorize]
-  before_action do
-    push_frontend_feature_flag(:import_requirements_csv, project, default_enabled: true)
-  end
 
   feature_category :requirements_management
 
@@ -37,8 +34,6 @@ class Projects::RequirementsManagement::RequirementsController < Projects::Appli
   private
 
   def authorize_import_access!
-    render_404 unless Feature.enabled?(:import_requirements_csv, project, default_enabled: true)
-
     return if can?(current_user, :import_requirements, project)
 
     if current_user || action_name == 'authorize'

ee/spec/requests/projects/requirements_management/requirements_controller_spec.rb

@@ -24,10 +24,6 @@ RSpec.describe Projects::RequirementsManagement::RequirementsController do
 
     subject { upload_file(file, workhorse_headers, params) }
 
-    before do
-      stub_feature_flags(import_requirements_csv: true)
-    end
-
     context 'unauthorized' do
       context 'when user is not signed in' do
         it_behaves_like 'response with 404 status'
@@ -102,14 +98,6 @@ RSpec.describe Projects::RequirementsManagement::RequirementsController do
       end
     end
 
-    context 'when requirements import FF is disabled' do
-      before do
-        stub_feature_flags(import_requirements_csv: false)
-      end
-
-      it_behaves_like 'response with 404 status'
-    end
-
     def upload_file(file, headers = {}, params = {})
       workhorse_finalize(
         import_csv_project_requirements_management_requirements_path(project),
@@ -128,34 +116,33 @@ RSpec.describe Projects::RequirementsManagement::RequirementsController do
         headers: workhorse_headers
     end
 
-    context 'with an authorized user' do
+    before do
+      login_as(user)
+      stub_licensed_features(requirements: true)
+    end
+
+    context 'with authorized user' do
       before do
         project.add_reporter(user)
       end
 
-      context 'when feature is available' do
-        before do
-          stub_licensed_features(requirements: true)
-          stub_feature_flags(import_requirements_csv: true)
-        end
-
+      context 'when requirements feature is enabled' do
         it_behaves_like 'handle uploads authorize request' do
           let(:uploader_class) { FileUploader }
           let(:maximum_size) { Gitlab::CurrentSettings.max_attachment_size.megabytes }
         end
       end
 
-      context 'when feature is disabled' do
+      context 'when requirements feature is disabled' do
         before do
-          stub_licensed_features(requirements: true)
-          stub_feature_flags(import_requirements_csv: true)
+          stub_licensed_features(requirements: false)
         end
 
         it_behaves_like 'response with 404 status'
       end
     end
 
-    context 'with an authorized user' do
+    context 'with unauthorized user' do
       it_behaves_like 'response with 404 status'
     end
   end