Improve log output for Services with no LoadBalancer IP

[lou-lan]

Fixes #14787

Release Note

Improve default-domain log output for Services with no LoadBalancer IP

[knative-prow]

Hi @lou-lan. Thanks for your PR.

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[dprotaso]

/ok-to-test
/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, lou-lan

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8cc9af3) 86.05% compared to head (685efa7) 86.04%.
Report is 50 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14788      +/-   ##
==========================================
- Coverage   86.05%   86.04%   -0.01%     
==========================================
  Files         197      197              
  Lines       14937    14950      +13     
==========================================
+ Hits        12854    12864      +10     
- Misses       1774     1776       +2     
- Partials      309      310       +1     

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