Implement a DELETE endpoint for managed registries

[rdimitrov]

The following PR implements the DELETE endpoint for managed registries

[codecov-commenter]

Codecov Report

❌ Patch coverage is 3.00000% with 97 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.30%. Comparing base (bde6902) to head (1396bcd).

Files with missing lines	Patch %	Lines
internal/service/db/impl.go	0.00%	34 Missing ⚠️
internal/api/registry/v01/routes.go	3.33%	29 Missing ⚠️
internal/service/mocks/mock_service.go	0.00%	12 Missing ⚠️
internal/db/sqlc/registry.sql.go	0.00%	11 Missing ⚠️
internal/service/service.go	25.00%	6 Missing ⚠️
internal/db/sqlc/servers.sql.go	0.00%	3 Missing ⚠️
internal/service/inmemory/impl.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #182      +/-   ##
==========================================
- Coverage   67.20%   65.30%   -1.91%     
==========================================
  Files          57       57              
  Lines        3482     3565      +83     
==========================================
- Hits         2340     2328      -12     
- Misses        986     1082      +96     
+ Partials      156      155       -1     

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