Alerting: API to convert submitted Prometheus rules to GMA (#102231)

* placeholder commit

* Complete function in api_convert_prometheus.go

* MVP before extensive testing

* Cleanup

* Updated tests

* cleanup

* Fix random logs and lint

* Remove comment

* Fix errors after rebase

* Update test

* Update swagger

* swagger

* Refactor to accept groups in body

* Fix auth tests and some cleanup

* Some cleanup before refactoring

* Remove unnecessary fields

* Also refactor RouteConvertPrometheusPostRuleGroup

* Remove unused code

* Rebase + cleanup

* Update authorization_test

* address comments

* Regen swagger files

* Remove namespace and group filters

* Final comments

pkg/services/ngalert/api/authorization_test.go

@@ -41,7 +41,7 @@ func TestAuthorize(t *testing.T) {
 		}
 		paths[p] = methods
 	}
-	require.Len(t, paths, 63)
+	require.Len(t, paths, 64)
 
 	ac := acmock.New()
 	api := &API{AccessControl: ac, FeatureManager: featuremgmt.WithFeatures()}