GOATS-809: Update LCO login to test with portal endpoint.

[davner]

Checklist

• Added a release note in doc/changes using the PR number.

[codecov]

Codecov Report

❌ Patch coverage is 12.50000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.47%. Comparing base (33196fa) to head (34d785d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/goats_tom/views/logins/lco.py	12.50%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   75.52%   75.47%   -0.06%     
==========================================
  Files         215      215              
  Lines        6905     6911       +6     
  Branches      444      444              
==========================================
+ Hits         5215     5216       +1     
- Misses       1606     1611       +5     
  Partials       84       84              

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