Transforms: Extract Fields: Remove Deduplication feature toggle (#113709)

Remove extractFieldsNameDeduplication feature toggle

The extractFieldsNameDeduplication feature has reached GA (General Availability),
so the feature toggle is no longer needed. The name deduplication behavior is
now permanently enabled.

Changes:
- Removed feature toggle definition from registry.go
- Removed feature toggle check in extractFields.ts (always deduplicate now)
- Updated tests to remove feature toggle manipulation
- Regenerated feature toggle files

pkg/services/featuremgmt/registry.go

@@ -604,13 +604,6 @@ var (
 			Expression:      "true", // enabled by default
 			Owner:           identityAccessTeam,
 		},
-		{
-			Name:         "extractFieldsNameDeduplication",
-			Description:  "Make sure extracted field names are unique in the dataframe",
-			Stage:        FeatureStageExperimental,
-			FrontendOnly: true,
-			Owner:        grafanaDataProSquad,
-		},
 		{
 			Name:         "dashboardSceneForViewers",
 			Description:  "Enables dashboard rendering using Scenes for viewer roles",

pkg/services/featuremgmt/toggles_gen.csv

@@ -80,7 +80,6 @@ alertmanagerRemoteSecondary,experimental,@grafana/alerting-squad,false,false,fal
 alertingProvenanceLockWrites,experimental,@grafana/alerting-squad,false,false,false
 alertmanagerRemotePrimary,experimental,@grafana/alerting-squad,false,false,false
 annotationPermissionUpdate,GA,@grafana/identity-access-team,false,false,false
-extractFieldsNameDeduplication,experimental,@grafana/datapro,false,false,true
 dashboardSceneForViewers,GA,@grafana/dashboards-squad,false,false,true
 dashboardSceneSolo,GA,@grafana/dashboards-squad,false,false,true
 dashboardScene,GA,@grafana/dashboards-squad,false,false,true

pkg/services/featuremgmt/toggles_gen.go

@@ -331,10 +331,6 @@ const (
 	// Change the way annotation permissions work by scoping them to folders and dashboards.
 	FlagAnnotationPermissionUpdate = "annotationPermissionUpdate"
 
-	// FlagExtractFieldsNameDeduplication
-	// Make sure extracted field names are unique in the dataframe
-	FlagExtractFieldsNameDeduplication = "extractFieldsNameDeduplication"
-
 	// FlagDashboardSceneForViewers
 	// Enables dashboard rendering using Scenes for viewer roles
 	FlagDashboardSceneForViewers = "dashboardSceneForViewers"

pkg/services/featuremgmt/toggles_gen.json

@@ -1623,6 +1623,7 @@
         "name": "extractFieldsNameDeduplication",
         "resourceVersion": "1762442825881",
         "creationTimestamp": "2023-11-02T15:47:42Z",
+        "deletionTimestamp": "2025-11-11T16:00:57Z",
         "annotations": {
           "grafana.app/updatedTimestamp": "2025-11-06 15:27:05.88172 +0000 UTC"
         }