Move Linux-CPU-CI pipeline and training Linux CPU CI pipeline to github actions

[snnn]

Description:

Move Linux-CPU-CI pipeline and training Linux CPU CI pipeline to github actions.

This PR doesn't delete the old yaml file, which needs be done in another PR after talking to Pranav.

Motivation and Context

• Why is this change required? What problem does it solve?
• If it fixes an open issue, please link to the issue here.