Alerting: Add Modify export feature for Grafana-managed alert rules (#75114)

* Initial POC for modified rule expor

* Add rule and group export options to modified export

* Add feature toggle for modifier export

* Rename GrafanaRuleDesigner to ModifyExportRuleForm to identify it easily as a rule form

* Refactor naming and folder for RuleDesigner => ModifyExport

* Don't render more action drop-down button when no more actions are allowed

* Redirect cancel button to alert list view

* Fix modify export page being reloaded correctly without errors

* Fix test

* Protect modify-export route when toggle-feature is not enabled

* Fix css betterer error

* Address pr review coments

---------

Co-authored-by: Konrad Lalik <konrad.lalik@grafana.com>

pkg/services/featuremgmt/registry.go

@@ -808,5 +808,12 @@ var (
 			RequiresDevMode: true,
 			Owner:           grafanaAuthnzSquad,
 		},
+		{
+			Name:         "alertingModifiedExport",
+			Description:  "Enables using UI for provisioned rules modification and export",
+			Stage:        FeatureStageExperimental,
+			FrontendOnly: false,
+			Owner:        grafanaAlertingSquad,
+		},
 	}
 )

pkg/services/featuremgmt/toggles_gen.csv

@@ -115,3 +115,4 @@ httpSLOLevels,experimental,@grafana/hosted-grafana-team,false,false,true,false
 idForwarding,experimental,@grafana/grafana-authnz-team,true,false,false,false
 cloudWatchWildCardDimensionValues,GA,@grafana/aws-datasources,false,false,false,false
 externalServiceAccounts,experimental,@grafana/grafana-authnz-team,true,false,false,false
+alertingModifiedExport,experimental,@grafana/alerting-squad,false,false,false,false

pkg/services/featuremgmt/toggles_gen.go

@@ -470,4 +470,8 @@ const (
 	// FlagExternalServiceAccounts
 	// Automatic service account and token setup for plugins
 	FlagExternalServiceAccounts = "externalServiceAccounts"
+
+	// FlagAlertingModifiedExport
+	// Enables using UI for provisioned rules modification and export
+	FlagAlertingModifiedExport = "alertingModifiedExport"
 )