Rename track for performance.mark / measures without custom tracks as…

… Web Performance: Timings to align with Chrome

Summary:
Changelog: [internal]

Minor change to align with the Chrome DevTools performance panel.

Differential Revision: D60115147

packages/react-native/ReactCommon/react/nativemodule/webperformance/NativePerformance.cpp

@@ -36,7 +36,7 @@ namespace {
 #ifdef WITH_PERFETTO
 
 const std::string TRACK_PREFIX = "Track:";
-const std::string DEFAULT_TRACK_NAME = "Web Performance";
+const std::string DEFAULT_TRACK_NAME = "Web Performance: Timings";
 const std::string CUSTOM_TRACK_NAME_PREFIX = "Web Performance: ";
 
 std::tuple<std::string, std::string_view> parsePerfettoTrack(