Alerting: use alerting GrafanaReceiver and BuildReceiverConfiguration in Grafana (#65224)

* replace receiver errors with one from alerting
* add the converter to alerting models
* update buildReceiverIntegration to accept GrafanaReceiver
---------

Co-authored-by: George Robinson <george.robinson@grafana.com>

pkg/services/ngalert/api/api_alertmanager.go

@@ -406,7 +406,7 @@ func statusForTestReceivers(v []notifier.TestReceiverResult) int {
 		for _, next := range receiver.Configs {
 			if next.Error != nil {
 				var (
-					invalidReceiverErr notifier.InvalidReceiverError
+					invalidReceiverErr alertingNotify.InvalidReceiverError
 					receiverTimeoutErr alertingNotify.ReceiverTimeoutError
 				)
 				if errors.As(next.Error, &invalidReceiverErr) {

pkg/services/ngalert/api/api_alertmanager_test.go

@@ -108,7 +108,7 @@ func TestStatusForTestReceivers(t *testing.T) {
 				Name:   "test1",
 				UID:    "uid1",
 				Status: "failed",
-				Error:  notifier.InvalidReceiverError{},
+				Error:  alertingNotify.InvalidReceiverError{},
 			}},
 		}, {
 			Name: "test2",
@@ -116,7 +116,7 @@ func TestStatusForTestReceivers(t *testing.T) {
 				Name:   "test2",
 				UID:    "uid2",
 				Status: "failed",
-				Error:  notifier.InvalidReceiverError{},
+				Error:  alertingNotify.InvalidReceiverError{},
 			}},
 		}}))
 	})
@@ -148,7 +148,7 @@ func TestStatusForTestReceivers(t *testing.T) {
 				Name:   "test1",
 				UID:    "uid1",
 				Status: "failed",
-				Error:  notifier.InvalidReceiverError{},
+				Error:  alertingNotify.InvalidReceiverError{},
 			}},
 		}, {
 			Name: "test2",
@@ -156,7 +156,7 @@ func TestStatusForTestReceivers(t *testing.T) {
 				Name:   "test2",
 				UID:    "uid2",
 				Status: "failed",
-				Error:  notifier.ReceiverTimeoutError{},
+				Error:  alertingNotify.ReceiverTimeoutError{},
 			}},
 		}}))
 	})