reference-search: Handle multiple and missing issue references

[andersk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 86.36364% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.94%. Comparing base (d69b96d) to head (af42cbd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #246      +/-   ##
==========================================
- Coverage   71.86%   66.94%   -4.93%     
==========================================
  Files          19       22       +3     
  Lines        1770     2063     +293     
  Branches      107      121      +14     
==========================================
+ Hits         1272     1381     +109     
- Misses        498      680     +182     
- Partials        0        2       +2     

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