Split full CMORisation integration test entry points

[rbeucher]

Summary

• split full CMORisation integration tests into dedicated CMIP6, CMIP6Plus, and CMIP7 entry points
• update related test plumbing and table reference usage
• refresh test documentation where relevant

Notes

• excludes local workspace artifacts such as session dump files

Validation

• test updates intended for integration coverage paths

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.4%. Comparing base (ff1593a) to head (51deb0c).

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #472   +/-   ##
=====================================
  Coverage   78.4%   78.4%           
=====================================
  Files         33      33           
  Lines       6483    6483           
  Branches    1226    1226           
=====================================
  Hits        5082    5082           
  Misses      1128    1128           
  Partials     273     273           

Flag	Coverage Δ
unit	78.4% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.