test: adds tests for x509_certificate_subscription.go

[NickUfer]

No description provided.

[codecov]

Codecov Report

Patch coverage: 17.85% and project coverage change: -1.86 ⚠️

Comparison is base (d3b8ba1) 26.89% compared to head (e594fb1) 25.03%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #1      +/-   ##
==========================================
- Coverage   26.89%   25.03%   -1.86%     
==========================================
  Files          15       19       +4     
  Lines        1015     1278     +263     
==========================================
+ Hits          273      320      +47     
- Misses        707      920     +213     
- Partials       35       38       +3     

Impacted Files	Coverage Δ
internal/db/postgresql/repository/bundle.go	20.00% <0.00%> (ø)
internal/db/repository/bundle.go	0.00% <0.00%> (ø)
internal/db/repository/x509_private_key.go	0.00% <ø> (ø)
internal/service/x509_certificate.go	0.00% <0.00%> (ø)
internal/service/x509_certificate_subscription.go	0.00% <0.00%> (ø)
internal/service/x509_import.go	0.00% <0.00%> (ø)
internal/restserver/handlers.go	19.39% <100.00%> (ø)
internal/service/x509_private_key.go	55.10% <100.00%> (ø)

... and 3 files with indirect coverage changes

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