Remove `remote_mirrors_api` feature flag

lib/api/remote_mirrors.rb

@@ -5,9 +5,6 @@ module API
     include PaginationParams
 
     before do
-      # TODO: Remove flag: https://gitlab.com/gitlab-org/gitlab/issues/38121
-      not_found! unless Feature.enabled?(:remote_mirrors_api, user_project)
-
       unauthorized! unless can?(current_user, :admin_remote_mirror, user_project)
     end
 

spec/requests/api/remote_mirrors_spec.rb

@@ -24,19 +24,6 @@ describe API::RemoteMirrors do
       expect(response).to have_gitlab_http_status(:success)
       expect(response).to match_response_schema('remote_mirrors')
     end
-
-    # TODO: Remove flag: https://gitlab.com/gitlab-org/gitlab/issues/38121
-    context 'with the `remote_mirrors_api` feature disabled' do
-      before do
-        stub_feature_flags(remote_mirrors_api: false)
-      end
-
-      it 'responds with `not_found`' do
-        get api(route, user)
-
-        expect(response).to have_gitlab_http_status(:not_found)
-      end
-    end
   end
 
   describe 'POST /projects/:id/remote_mirrors' do
@@ -109,18 +96,5 @@ describe API::RemoteMirrors do
       expect(json_response['enabled']).to eq(false)
       expect(json_response['only_protected_branches']).to eq(true)
     end
-
-    # TODO: Remove flag: https://gitlab.com/gitlab-org/gitlab/issues/38121
-    context 'with the `remote_mirrors_api` feature disabled' do
-      before do
-        stub_feature_flags(remote_mirrors_api: false)
-      end
-
-      it 'responds with `not_found`' do
-        put api(route[mirror.id], user)
-
-        expect(response).to have_gitlab_http_status(:not_found)
-      end
-    end
   end
 end