Revert "feat(proxysetting): simplify proxy tenant handling"

[oliverbaehler]

Reverts #980

[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (414052e) to head (213fa5f).

Files with missing lines	Patch %	Lines
main.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1002   +/-   ##
=====================================
  Coverage   0.00%   0.00%           
=====================================
  Files          1       1           
  Lines        200     201    +1     
=====================================
- Misses       200     201    +1     

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