Add auth spans and remove deduplication code for scopes (#89804)

Adds more spans for timing in accesscontrol and remove permission deduplicating code after benchmarking

---------

Signed-off-by: Dave Henderson <dave.henderson@grafana.com>
Co-authored-by: Dave Henderson <dave.henderson@grafana.com>
Co-authored-by: Ieva <ieva.vasiljeva@grafana.com>

pkg/services/authn/authnimpl/sync/oauth_token_sync_test.go

@@ -10,6 +10,7 @@ import (
 	"golang.org/x/sync/singleflight"
 
 	"github.com/grafana/grafana/pkg/infra/log"
+	"github.com/grafana/grafana/pkg/infra/tracing"
 	"github.com/grafana/grafana/pkg/login/social"
 	"github.com/grafana/grafana/pkg/login/social/socialtest"
 	"github.com/grafana/grafana/pkg/services/auth"
@@ -128,6 +129,7 @@ func TestOAuthTokenSync_SyncOAuthTokenHook(t *testing.T) {
 				sessionService:    sessionService,
 				socialService:     socialService,
 				singleflightGroup: new(singleflight.Group),
+				tracer:            tracing.InitializeTracerForTest(),
 			}
 
 			err := sync.SyncOauthTokenHook(context.Background(), tt.identity, nil)