Add missing GestureLane case to getLabelForLane

GestureLane was added in #34546 but getLabelForLane was not updated.
The comment on line 38 states lane values should be kept in sync with
getLabelForLane, used by react-devtools-timeline. Without this case,
getLaneLabelMap returns undefined for GestureLane which gets cast to
the string "undefined" in the DevTools timeline.

Author: w3di

packages/react-reconciler/src/ReactFiberLane.js

@@ -144,6 +144,9 @@ export function getLabelForLane(lane: Lane): string | void {
     if (lane & DefaultLane) {
       return 'Default';
     }
+    if (lane & GestureLane) {
+      return 'Gesture';
+    }
     if (lane & TransitionHydrationLane) {
       return 'TransitionHydration';
     }