Update test dialer to use ip when available

[andrew-su]

With the changes to knative-extensions/net-gateway-api#685 where it is possible to have the ingress's public loadbalancer point to an IP instead of domain, we should use the value provided.

Changes

• 🐛 Don't expect there to only be domains, sometimes it might be an IP

/kind bug
/king cleanup

[izabelacg]

@dprotaso is it ok to include this PR (once is merged) in the already created release-1.14 branch?

[dprotaso]

Yeah I think it's fine to cherry pick once this merges since it's just some networking conformance test code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.41%. Comparing base (75762ca) to head (c6b8408).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #970      +/-   ##
==========================================
- Coverage   93.43%   93.41%   -0.02%     
==========================================
  Files          36       36              
  Lines        1249     1003     -246     
==========================================
- Hits         1167      937     -230     
+ Misses         69       53      -16     
  Partials       13       13              

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[dprotaso]

codegen timedout hitting go module cache

/retest

[dprotaso]

@andrew-su see the linter error

[dprotaso]

the linter is still going off

[dprotaso]

/lgtm
/approve

@izabelacg feel free to cherry-pick

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: andrew-su, dprotaso

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[izabelacg]

/cherry-pick release-1.14

[knative-prow-robot]

@izabelacg: new pull request created: #971

In response to this:

/cherry-pick release-1.14

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