Require unit tests in the pull request template

[papeh]

CI-ready checklist

• Commit messages follow .github/commit-guidelines.md.
• I have considered all comments from an AI code reviewer (such as Devin)

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This change is 

[github-actions]

NUnit Tests

    1 files  ±0      1 suites  ±0   11m 10s ⏱️ +10s
5 853 tests ±0  5 772 ✅ ±0  81 💤 ±0  0 ❌ ±0 
5 862 runs  ±0  5 781 ✅ ±0  81 💤 ±0  0 ❌ ±0 

Results for commit 4a4cc47. ± Comparison against base commit 6f72671.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.36%. Comparing base (6f72671) to head (4a4cc47).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1104      +/-   ##
==========================================
+ Coverage   38.33%   38.36%   +0.02%     
==========================================
  Files        1507     1507              
  Lines      350580   350580              
  Branches    40293    40293              
==========================================
+ Hits       134410   134501      +91     
+ Misses     186941   186900      -41     
+ Partials    29229    29179      -50     

see 10 files with indirect coverage changes

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