feat(registry): add configurable timeout for tag deletion

[Mia-Cross]

Relates to scaleway-sdk-go#2674

[codecov-commenter]

Codecov Report

❌ Patch coverage is 29.72973% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.45%. Comparing base (449138e) to head (ce35b4f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/testhelpers/helpers_registry.go	0.00%	45 Missing ⚠️
core/testing.go	0.00%	4 Missing ⚠️
internal/namespaces/registry/v1/custom_tag.go	87.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5098      +/-   ##
==========================================
+ Coverage   57.43%   57.45%   +0.01%     
==========================================
  Files         308      308              
  Lines       67218    67280      +62     
==========================================
+ Hits        38608    38657      +49     
- Misses      27173    27182       +9     
- Partials     1437     1441       +4     

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