fix(excel): class names longer than 31 chars

[noelmcloughlin]

Summary

Fixes #3526

Compute a deterministic, collision-free sheet title once per class and use it for both create_sheet and the subsequent lookup.

Keep acls_name -> sheet_title map.

How was this tested?

Areas of uncertainty

Checklist

• My code follows the contributor guidelines
• I have added tests that prove my fix/feature works
• Existing tests pass locally with my changes

AI Assistance

LLM assisted unit tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.59%. Comparing base (877584d) to head (1cfb7c3).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3527      +/-   ##
==========================================
+ Coverage   80.14%   83.59%   +3.44%     
==========================================
  Files         157      157              
  Lines       18659    18677      +18     
  Branches     3931     3934       +3     
==========================================
+ Hits        14955    15613     +658     
+ Misses       2869     2183     -686     
- Partials      835      881      +46     

Flag	Coverage Δ
linkml	80.17% <100.00%> (+0.03%)	⬆️
runtime	80.17% <100.00%> (+0.03%)	⬆️

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

☔ 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.

[sujaypatil96]

Thanks for implementing a solution for the case when the class name length is >= 31 characters. The collision free/safe title name generation logic looks good and is an effective truncation strategy! definitely better than what we have already where the generation simply crashes/errors out, so love the improvement 🚀