Plugin Extensions: Read-only props for extension components (#102079)

* feat: pass read-only props to extension components

This initial commit is used to verify that things are broken in case
the datasource object is not cloned before passed in as a prop.

* chore: update tests

---------

Co-authored-by: Hugo Häggmark <hugo.haggmark@gmail.com>

pkg/services/featuremgmt/registry.go

@@ -1765,6 +1765,15 @@ var (
 			HideFromDocs:      true,
 			Expression:        "true", // enabled by default
 		},
+		{
+			Name:              "extensionsReadOnlyProxy",
+			Description:       "Use proxy-based read-only objects for plugin extensions instead of deep cloning",
+			Stage:             FeatureStageExperimental,
+			Owner:             grafanaPluginsPlatformSquad,
+			HideFromAdminPage: true,
+			HideFromDocs:      true,
+			FrontendOnly:      true,
+		},
 	}
 )
 

pkg/services/featuremgmt/toggles_gen.csv

@@ -231,3 +231,4 @@ multiTenantFrontend,experimental,@grafana/grafana-frontend-platform,false,false,
 alertingListViewV2PreviewToggle,privatePreview,@grafana/alerting-squad,false,false,true
 alertRuleUseFiredAtForStartsAt,experimental,@grafana/alerting-squad,false,false,false
 alertingBulkActionsInUI,GA,@grafana/alerting-squad,false,false,true
+extensionsReadOnlyProxy,experimental,@grafana/plugins-platform-backend,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -934,4 +934,8 @@ const (
 	// FlagAlertingBulkActionsInUI
 	// Enables the alerting bulk actions in the UI
 	FlagAlertingBulkActionsInUI = "alertingBulkActionsInUI"
+
+	// FlagExtensionsReadOnlyProxy
+	// Use proxy-based read-only objects for plugin extensions instead of deep cloning
+	FlagExtensionsReadOnlyProxy = "extensionsReadOnlyProxy"
 )