AlertingNG: Enforce unique alert definition title (non empty)/UID per organisation (#30380)

* Enforce unique alert definition title/uid per org

* Remove print statement from test

* Do not allow empty alert definition titles

* update error message on dup title

* also add title error to update

* CamelCase json properties

* Add test for title unique enforcement in updates

Co-authored-by: kyle <kyle@grafana.com>

pkg/services/ngalert/eval/alert_query.go

@@ -40,8 +40,8 @@ func (d *Duration) UnmarshalJSON(b []byte) error {
 // RelativeTimeRange is the per query start and end time
 // for requests.
 type RelativeTimeRange struct {
-	From Duration
-	To   Duration
+	From Duration `json:"from"`
+	To   Duration `json:"to"`
 }
 
 // isValid checks that From duration is greater than To duration.

pkg/services/ngalert/eval/alert_query_test.go

@@ -204,7 +204,6 @@ func TestAlertQuery(t *testing.T) {
 				err = json.Unmarshal(blob, &model)
 				require.NoError(t, err)
 
-				fmt.Printf(">>>>>>> %+v %+v\n", tc.alertQuery, model)
 				i, ok := model["datasource"]
 				require.True(t, ok)
 				datasource, ok := i.(string)