feat(server): remove allow_deprecated_images from hcloud_server

[jooola]

Fixes #1434

[codecov]

Codecov Report

❌ Patch coverage is 0% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.97%. Comparing base (a1b1d3a) to head (de63aa5).

Files with missing lines	Patch %	Lines
internal/server/resource.go	0.00%	11 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1435      +/-   ##
==========================================
- Coverage   72.98%   72.97%   -0.02%     
==========================================
  Files         112      112              
  Lines       12536    12538       +2     
==========================================
  Hits         9150     9150              
- Misses       2320     2322       +2     
  Partials     1066     1066              

Flag	Coverage Δ
e2e	72.97% <0.00%> (-0.02%)	⬇️
unit	37.78% <0.00%> (-0.01%)	⬇️

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