Use time_costs_total for output_stats (#26313)
### Description
- Use total inference time instead of the submission time for output
statistics calculation
### Motivation and Context
- The min, max, and other statistics reported for inference were using
device submission time instead of the inference time.
@ishwar-raut1 @gaugarg-nv @thevishalagarwal @umangb-09 @gedoensmax
