chore: increase parallelism for win CI (#27376)
### Description
Remove parallelism limits for C++ translation. Primarily affects Win CI
jobs.
### Motivation and Context
Win CI builds were limited to 4 cores. This is a complete waste of time
when we're using 32 core machines.
This saves ~2.25h for a windows build. See:
https://aiinfra.visualstudio.com/Lotus/_build/results?buildId=1089604
