Tempo: Migrates tags and tag values to datasource backend CallResource requests (#110511)

* Move tags and tag values request to datasource backend

* Remove outdated test

* Fix tests

* lint

* Refactor to use handlers for CallResource request

* lint

* Fix nit

pkg/plugins/backendplugin/coreplugin/registry.go

@@ -235,7 +235,7 @@ func NewPlugin(pluginID string, cfg *setting.Cfg, httpClientProvider *httpclient
 	case Prometheus:
 		svc = prometheus.ProvideService(httpClientProvider)
 	case Tempo:
-		svc = tempo.ProvideService(httpClientProvider)
+		svc = tempo.ProvideService(httpClientProvider, tracer)
 	case PostgreSQL:
 		svc = postgres.ProvideService(cfg, features)
 	case MySQL: