[Alerting]: Several modifications in alert rules (#32983)

* [Alerting]: Use common properties for all rules

* Add Labels in rules

* Fix update ruleGroup API

Return 400 Bad Request response
when the request contains a UID that does not exist

* Check permissions and return namespace id

* Apply suggestions from code review

Co-authored-by: gotjosh <josue@grafana.com>

pkg/services/ngalert/api/test-data/prom.http

@@ -0,0 +1,7 @@
+
+@grafanaRecipient = grafana
+
+GET http://admin:admin@localhost:3000/api/prometheus/{{grafanaRecipient}}/api/v1/rules
+
+###
+GET http://admin:admin@localhost:3000/api/prometheus/{{grafanaRecipient}}/api/v1/alerts