fix(runner): stop events executing after exit

[emiyl]

This stops events from executing after the runner has been signalled to exit by adding an extra check into Runner_executeResolvedEvent.

In one of my tests, I kept getting an extra Step log even after game_end had been called.

===== PATH TEST END =====
MOVE x=64 y=64 path_position=1

In GameMaker Runtime 2026.0.0.23, the last line did not appear.