fix: use dns zone to deduplicate SRV records

[mauritsderuiter95]

close #3592

Proposal as described here: #3592 (comment)

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Codecov Report

❌ Patch coverage is 45.83333% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 2.33%. Comparing base (342cbc6) to head (e5d18ed).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/domain/record.go	0.00%	10 Missing ⚠️
internal/services/domain/helpers.go	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3596      +/-   ##
=========================================
- Coverage    2.34%   2.33%   -0.02%     
=========================================
  Files         445     445              
  Lines       48555   48557       +2     
=========================================
- Hits         1140    1132       -8     
- Misses      47325   47334       +9     
- Partials       90      91       +1     

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Pull request overview

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[mauritsderuiter95]

After a rebase on master the golanci-lint is failing on unrelated code. I believe ##3597 has the same issue.