Move authorization_test.rs from integration tests to router.rs

[stacktraceghost]

Resolves #2627

• Moved test test_route_authorization to router.rs
• Removed authorization_test.rs from integration tests

[github-actions]

Sigrid maintainability feedback

💭️ You did not change any files that are analyzed by Sigrid.

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[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.83%. Comparing base (3dbdaa5) to head (7bada72).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
backend/src/router.rs	88.70%	5 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2710      +/-   ##
==========================================
- Coverage   91.85%   91.83%   -0.03%     
==========================================
  Files         375      375              
  Lines       18984    19046      +62     
  Branches     1968     1977       +9     
==========================================
+ Hits        17438    17491      +53     
- Misses       1452     1458       +6     
- Partials       94       97       +3     

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[github-actions]

PDF Diff Summary

Comparing against base branch: main

File	Status
model-n-10-2.pdf	✅ No changes
model-na-14-2-bijlage1.pdf	✅ No changes
model-na-14-2.pdf	✅ No changes
model-na-31-2-bijlage1.pdf	✅ No changes
model-na-31-2-inlegvel.pdf	✅ No changes
model-na-31-2.pdf	✅ No changes
model-p-2a.pdf	✅ No changes