Feature toggle: Remove groupToNestedTableTransformation feature toggle (#113761)

Remove groupToNestedTableTransformation feature toggle

The group to nested table transformation has reached GA and is now
enabled by default. This commit removes the feature toggle and makes
the transformation always available.

Changes:
- Removed feature toggle definition from registry.go
- Updated standardTransformers.ts to always include the transformation
- Updated feature toggles documentation
- Regenerated feature toggle files

pkg/services/featuremgmt/registry.go

@@ -817,14 +817,6 @@ var (
 			FrontendOnly: true,
 			Owner:        grafanaDataProSquad,
 		},
-		{
-			Name:         "groupToNestedTableTransformation",
-			Description:  "Enables the group to nested table transformation",
-			Stage:        FeatureStageGeneralAvailability,
-			FrontendOnly: true,
-			Owner:        grafanaDataProSquad,
-			Expression:   "true", // enabled by default,
-		},
 		{
 			Name:        "newPDFRendering",
 			Description: "New implementation for the dashboard-to-PDF rendering",

pkg/services/featuremgmt/toggles_gen.csv

@@ -107,7 +107,6 @@ useMultipleScopeNodesEndpoint,experimental,@grafana/grafana-operator-experience-
 logQLScope,privatePreview,@grafana/observability-logs,false,false,false
 sqlExpressions,preview,@grafana/grafana-datasources-core-services,false,false,false
 sqlExpressionsColumnAutoComplete,experimental,@grafana/datapro,false,false,true
-groupToNestedTableTransformation,GA,@grafana/datapro,false,false,true
 newPDFRendering,GA,@grafana/grafana-operator-experience-squad,false,false,false
 kubernetesAggregator,experimental,@grafana/grafana-app-platform-squad,false,true,false
 kubernetesAggregatorCapTokenAuth,experimental,@grafana/grafana-app-platform-squad,false,true,false

pkg/services/featuremgmt/toggles_gen.go

@@ -439,10 +439,6 @@ const (
 	// Enables column autocomplete for SQL Expressions
 	FlagSqlExpressionsColumnAutoComplete = "sqlExpressionsColumnAutoComplete"
 
-	// FlagGroupToNestedTableTransformation
-	// Enables the group to nested table transformation
-	FlagGroupToNestedTableTransformation = "groupToNestedTableTransformation"
-
 	// FlagNewPDFRendering
 	// New implementation for the dashboard-to-PDF rendering
 	FlagNewPDFRendering = "newPDFRendering"

pkg/services/featuremgmt/toggles_gen.json

@@ -1963,6 +1963,7 @@
         "name": "groupToNestedTableTransformation",
         "resourceVersion": "1762442825881",
         "creationTimestamp": "2024-02-07T14:28:26Z",
+        "deletionTimestamp": "2025-11-12T14:33:44Z",
         "annotations": {
           "grafana.app/updatedTimestamp": "2025-11-06 15:27:05.88172 +0000 UTC"
         }