feat: add short URL support for OAuth2 authentication

[jkroepke]

What this PR does / why we need it

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

• fixes #

Special notes for your reviewer

Particularly user-facing changes

Checklist

Complete these before marking the PR as ready to review:

• DCO signed
• The PR title has a summary of the changes
• The PR body has a summary to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

❌ Patch coverage is 80.95238% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.88%. Comparing base (473b911) to head (b7576ef).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/httphandler/handler.go	60.00%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
- Coverage   85.14%   84.88%   -0.26%     
==========================================
  Files          52       52              
  Lines        3533     3552      +19     
==========================================
+ Hits         3008     3015       +7     
- Misses        399      409      +10     
- Partials      126      128       +2     

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