Incorporate Umask Extensions when parsing JSON events

[williamsumendap]

Summary: Some events have the same code and umask, thus having identical configuration under hbt's event definitions.

This should not be the case, however, because Intel differentiates them via umask extensions that wasn't parsed prior to this diff.

NOTE: fbcode/hbt/src/perf_event/json_events/fb/generate.py are manual changes (by me), but the file is marked generated by D55156319

Differential Revision: D56416468