Migrate GitHub CI to NVIDIA's internal CI system

[madil90]

Is your feature request related to a problem? Please describe.
GitHub CI/CD is currently unscalable & the increased number of users have made PR merge times very large.

Describe the solution you'd like
NVIDIA's internal CI/CD solution can scale and has access to a variety of GPU types for thorough testing. GitHub CI/CD will be deprecated and NVIDIA's solution will be used instead.

Details

• The nightly & release pipelines will run inside NVIDIA's system independent of GitHub.
• The pre-merge pipeline will be connected to GitHub. Authorized users can comment '/build' to launch a job. Logs of the job will be sent back to GitHub.