Tempo: Consider tempo search out of beta and remove beta badge and feature flags (#50030)

* Tempo: Remove beta notice and feature flag for search

* remove unused imports

pkg/services/featuremgmt/registry.go

@@ -66,17 +66,6 @@ var (
 			Description: "Search for dashboards using panel title",
 			State:       FeatureStateAlpha,
 		},
-		{
-			Name:         "tempoSearch",
-			Description:  "Enable searching in tempo datasources",
-			State:        FeatureStateBeta,
-			FrontendOnly: true,
-		},
-		{
-			Name:        "tempoBackendSearch",
-			Description: "Use backend for tempo search",
-			State:       FeatureStateBeta,
-		},
 		{
 			Name:         "tempoServiceGraph",
 			Description:  "show service",