feat(edge-services): add default fqdn on dns stage

[yfodil]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.75%. Comparing base (e9e8231) to head (ab562f3).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
internal/services/edgeservices/dns_stage.go	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3459      +/-   ##
=========================================
- Coverage    1.76%   1.75%   -0.01%     
=========================================
  Files         400     400              
  Lines       43839   43845       +6     
=========================================
- Hits          774     770       -4     
- Misses      42978   42986       +8     
- Partials       87      89       +2     

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