clean-up test ci yaml generater

[calad0i]

Description

Cleanup the test yaml generator a bit:

• All tests (include the optimization api ones) are batched together
• Prefer to group tests need example-models together

Type of change

• Housekeeping

Tests

Checklist

• I have read the guidelines for contributing.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have installed and run pre-commit on the files I edited or added.
• I have added tests that prove my fix is effective or that my feature works.

[jmitrevs]

There is no reason why the initial part uses 3.8. It can be swapped for 3.10 or later easily. That part just needs a python environment.