Rework fixtures to avoid skips

[marcpaterno]

Description

This PR modifies fixtures in test_ccl_factory.py to reduce the number of skips. This reduces the number of skips due to "CAMB extra parameters are only compatible with PUR_CCL_MODE from > 380 to 0..

Type of change

• Refactoring

Checklist:

• I have run bash pre-commit-check and fixed any issues
• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation
• I have 100% test coverage for my changes (please check this after the CI system has verified the coverage)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.0%. Comparing base (ca6245f) to head (4f7447e).
⚠️ Report is 98 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #557   +/-   ##
=======================================
  Coverage   100.0%   100.0%           
=======================================
  Files          50       50           
  Lines        5115     5115           
  Branches      580      580           
=======================================
  Hits         5115     5115           

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