Alerting: Update grafana/alerting (#88363)

* Alerting: Update grafana/alerting

* make tests pass by implementing yaml unmarshallers and deleting fields with omitempty in their yaml tags

* go mod tidy

* fix tests by implementing not calling GettableApiAlertingConfig.UnmarshalYAML from GettableApiAlertingConfig.UnmarshalJSON

* cleanup, reduce diff

* fix more tests

* update grafana/alerting to latest commit, delete global section from configs in tests

* bring back YAML unmarshaller for GettableApiAlertingConfig

* update alerting package dependency to point to main

* skip test for sns notifier

pkg/tests/api/alerting/api_alertmanager_test.go

@@ -151,7 +151,6 @@ func TestIntegrationAMConfigAccess(t *testing.T) {
 			"template_files": null,
 			"alertmanager_config": {
 				"route": %s,
-				"templates": null,
 				"receivers": [{
 					"name": "grafana-default-email",
 					"grafana_managed_receiver_configs": [{
@@ -2058,7 +2057,6 @@ func TestIntegrationAlertmanagerStatus(t *testing.T) {
 	},
 	"config": {
 		"route": %s,
-		"templates": null,
 		"receivers": [{
 			"name": "grafana-default-email",
 			"grafana_managed_receiver_configs": [{
@@ -2068,8 +2066,7 @@ func TestIntegrationAlertmanagerStatus(t *testing.T) {
 				"disableResolveMessage": false,
 				"settings": {
 					"addresses": "\u003cexample@email.com\u003e"
-				},
-				"secureSettings": null
+				}
 			}]
 		}]
 	},