Remove import_issues_csv feature flag

Also remove test for the feature flag

app/controllers/projects/issues_controller.rb

@@ -178,8 +178,6 @@ class Projects::IssuesController < Projects::ApplicationController
   end
 
   def import_csv
-    return render_404 unless Feature.enabled?(:issues_import_csv)
-
     if uploader = UploadService.new(project, params[:file]).execute
       ImportIssuesCsvWorker.perform_async(current_user.id, project.id, uploader.upload.id)
 

app/views/projects/issues/_nav_btns.html.haml

 - show_feed_buttons = local_assigns.fetch(:show_feed_buttons, true)
-- show_import_button = local_assigns.fetch(:show_import_button, true) && Feature.enabled?(:issues_import_csv) && can?(current_user, :import_issues, @project)
+- show_import_button = local_assigns.fetch(:show_import_button, true) && can?(current_user, :import_issues, @project)
 - show_export_button = local_assigns.fetch(:show_export_button, true)
 
 .nav-controls.issues-nav-controls

app/views/shared/empty_states/_issues.html.haml

 - button_path = local_assigns.fetch(:button_path, false)
 - project_select_button = local_assigns.fetch(:project_select_button, false)
-- show_import_button = local_assigns.fetch(:show_import_button, false) && Feature.enabled?(:issues_import_csv) && can?(current_user, :import_issues, @project)
+- show_import_button = local_assigns.fetch(:show_import_button, false) && can?(current_user, :import_issues, @project)
 - has_button = button_path || project_select_button
 - closed_issues_count = issuables_count_for_state(:issues, :closed)
 - opened_issues_count = issuables_count_for_state(:issues, :opened)

spec/controllers/projects/issues_controller_spec.rb

@@ -1030,19 +1030,6 @@ describe Projects::IssuesController do
     let(:project) { create(:project, :public) }
     let(:file) { fixture_file_upload('spec/fixtures/csv_comma.csv') }
 
-    context 'feature disabled' do
-      it 'returns 404' do
-        sign_in(user)
-        project.add_maintainer(user)
-
-        stub_feature_flags(issues_import_csv: false)
-
-        import_csv
-
-        expect(response).to have_gitlab_http_status :not_found
-      end
-    end
-
     context 'unauthorized' do
       it 'returns 404 for guests' do
         sign_out(:user)