Fix probing when KIngress has multiple visibilities (External/ClusterLocal)

[dprotaso]

Serving uses multiple visibilities in it's KIngress which triggered a problem in the three phase probing.

This issue fixes that problem and adds the serving specific test cases

Fixes: #18

Unblocks - knative/serving#15136

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso

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[dprotaso]

/assign @izabelacg

[codecov]

Codecov Report

Attention: Patch coverage is 83.78378% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 78.05%. Comparing base (cd525ad) to head (b134949).
Report is 24 commits behind head on main.

Files	Patch %	Lines
pkg/reconciler/ingress/reconcile_resources.go	80.76%	5 Missing ⚠️
pkg/reconciler/ingress/ingress.go	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #693       +/-   ##
===========================================
+ Coverage   66.97%   78.05%   +11.08%     
===========================================
  Files          15       16        +1     
  Lines         863     1103      +240     
===========================================
+ Hits          578      861      +283     
+ Misses        254      203       -51     
- Partials       31       39        +8     

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[izabelacg]

/lgtm