Simplify commands for NILRT build and use Ninja

[maxxboehme]

What does this Pull Request accomplish?

• Remove extra steps that were in the build process that were not needed.
• Running many of the build steps that were running cmake through cmake for no extra benefit
  • Some when building were trying to find the error messages and report that out. This can be added later if needed
• Standardize on the way to reference variables.
• Use Ninja as generator to match Windows and Ubuntu builds. Along with using SimenB/github-actions-cpu-cores so we can utilize all the cores provided by the build machine when building. This had an 18% speed up improvement.

Why should this Pull Request be merged?

Simplify the build steps so that setup and configuration of the build can easily be followed for personal setup.

What testing has been done?

• PR Build
  • Made sure that the created artifacts match what the latest CI build created.