[Mosaic GPU] Use events as the default profiling method

JAX still supports old CUDA versions such as 12.0, where CUPTI leaks memory.

PiperOrigin-RevId: 705459909

jax/experimental/mosaic/gpu/profiler.py

@@ -114,7 +114,7 @@ def wrapper(*args, **kwargs):
   return wrapper
 
 
-def measure(f: Callable, *, mode: str = "cupti", aggregate: bool = True
+def measure(f: Callable, *, mode: str = "events", aggregate: bool = True
 ) -> Callable:
   """Sets up a function ``f`` for profiling on GPU.