Revert headless service change from k8s private service

[izabelacg]

Fixes #15267

Proposed Changes

• Revert PR change private K8s service to be a headless service #15170 since it interferes with istio in mesh mode

Release Note

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.79%. Comparing base (7fab945) to head (2b6388e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15275      +/-   ##
==========================================
+ Coverage   84.76%   84.79%   +0.02%     
==========================================
  Files         218      218              
  Lines       13479    13478       -1     
==========================================
+ Hits        11426    11429       +3     
+ Misses       1687     1684       -3     
+ Partials      366      365       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[dprotaso]

GitHub Actions has encountered an internal error when running your job.

weird - i've seen it a bunch of times this morning but the github status page shows no issues

[dprotaso]

re-running github jobs

[dprotaso]

/test all

[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, izabelacg

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [dprotaso]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[dprotaso]

/retest