Add QA checks on ESM1.6 metadata fields.

[Qian-HuiChen]

This PR add QA checks on metadata fields in ESM1.6 config repository, including:

• "model" == "ACCESS-ESM1.6"
• "url" == "https://github.com/ACCESS-NRI/access-esm1.6-configs.git"
• "reference" == "https://doi.org/10.5281/zenodo.17490072"
• "note" and "description" do not contain string ESM1.5

Closes #221 .

[Qian-HuiChen]

Tests (test_test_access_esm1p6_config_release_release_preindustrial) needs to be re-run after ESM1.6 metadata is updated (see file).

[anton-seaice]

The content of this change looks fine. I don't really think doing CI tests (of tests) using the real configs is a good idea (as they can't ever pass when a requirement changes, and there's no independence between tests & config) but that is largely related to this issue !

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.06%. Comparing base (8e69cc4) to head (5ba476e).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #222      +/-   ##
==========================================
+ Coverage   87.72%   90.06%   +2.34%     
==========================================
  Files          22       22              
  Lines        1303     1308       +5     
==========================================
+ Hits         1143     1178      +35     
+ Misses        160      130      -30     

☔ View full report in Codecov by Sentry.
📢 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.

[aidanheerdegen]

LGTM