Cloudwatch: Deprecate cloudwatchNewRegionsHandler feature toggle and remove core imports from featuremgmt (#81310)

* Remove core imports from grafana/pkg/services/featuremgmt in CloudWatch

pkg/tsdb/cloudwatch/resource_handler.go

@@ -10,7 +10,6 @@ import (
 	"github.com/grafana/grafana-plugin-sdk-go/backend"
 	"github.com/grafana/grafana-plugin-sdk-go/backend/resource/httpadapter"
 
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/grafana/grafana/pkg/tsdb/cloudwatch/routes"
 )
 
@@ -27,14 +26,7 @@ func (e *cloudWatchExecutor) newResourceMux() *http.ServeMux {
 	mux.HandleFunc("/namespaces", routes.ResourceRequestMiddleware(routes.NamespacesHandler, logger, e.getRequestContext))
 	mux.HandleFunc("/log-group-fields", routes.ResourceRequestMiddleware(routes.LogGroupFieldsHandler, logger, e.getRequestContext))
 	mux.HandleFunc("/external-id", routes.ResourceRequestMiddleware(routes.ExternalIdHandler, logger, e.getRequestContext))
-
-	// feature is enabled by default, just putting behind a feature flag in case of unexpected bugs
-	if e.features.IsEnabledGlobally(featuremgmt.FlagCloudwatchNewRegionsHandler) {
-		mux.HandleFunc("/regions", routes.ResourceRequestMiddleware(routes.RegionsHandler, logger, e.getRequestContext))
-	} else {
-		mux.HandleFunc("/regions", handleResourceReq(e.handleGetRegions))
-	}
-
+	mux.HandleFunc("/regions", routes.ResourceRequestMiddleware(routes.RegionsHandler, logger, e.getRequestContext))
 	// remove this once AWS's Cross Account Observability is supported in GovCloud
 	mux.HandleFunc("/legacy-log-groups", handleResourceReq(e.handleGetLogGroups))