Consider removing scripts_regression_tests workflow, likely replacing it with something else

[billsacks]

The srt.yml workflow has been failing recently (due to ESMCI/cime#4965). This raised the question for me as to why we are running scripts_regression_tests from CMEPS. Should we remove this? Perhaps we can replace it with running some small CMEPS-focused test list?

It looks like this was originally added by @fischer-ncar and @jedwards4b .

[fischer-ncar]

I believe Jim added this since the CIME scripts_regression_tests depended on CMEPS. I'm not sure if this is still true or not.

[billsacks]

Thanks, @fischer-ncar - that makes sense and it's good to know the background.

My feeling is that we should get rid of running the full scripts_regression_tests and instead run a select set of tests more tailored to exercising cmeps that would hopefully pick up any issues that would impact scripts_regression_tests or any other testing that requires cmeps (which is really all testing in the CESM context).