Updates to CI testing + support for Intel oneApi.

[dustinswales]

This PR contains several changes to the CI based testing system.

• Replaces Ubuntu GitHub runner based CI with Containerized CI (Thanks @RobertPincus for paving the way in rte-rrtmgp!)
• New Docker files for each piece of the CCPP SCM software stack (e.g. gnu, oneapi, netcdf).
• Docker images (GNU, Intel oneAPI, nvhpc) for CCPP SCM
• Intel oneAPI CI tests
• Changes to utility scripts used during CI
• Remove deprecated CI scripts

Other changes worth noting.

• All test configurations are controlled in a single file, test/rt_test_cases.py. Individual tests can now be turned on/off.
• Tests have been broken down into "supported", "legacy" and "dev". UPDATE: This is a workaround for the limitation on the number of SDFs that can be used with Intel oneAPI.

@grantfirl @scrasmussen @mkavulich @hertneky The failing tests (pushing image to dockerhub) are related to permissions. These tests all pass in my fork.

I was able to create a GitHub secret with my dockerhub credentials, but this didn't work. I also tried using the existing GitHub secrets for the dtcenter dockerhub repository, but this didn't work correctly either.
I don't have Admin access in this repo ?!? so maybe it's related to that?

[dustinswales]

@grantfirl @scrasmussen @hertneky
This is ready for review when you get a chance.
The new CI test to create the images is working, but it relies on github secrets, which can't be referenced by the incoming PR for security reasons.

[hertneky]

Looks good, thanks!