Switch e2e testing assertions to use EndpointSlices

[dprotaso]

Part of #7701

[knative-prow]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.24%. Comparing base (56f2186) to head (8db856b).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16454      +/-   ##
==========================================
+ Coverage   80.17%   80.24%   +0.07%     
==========================================
  Files         217      217              
  Lines       13520    13520              
==========================================
+ Hits        10839    10849      +10     
+ Misses       2314     2305       -9     
+ Partials      367      366       -1     

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[dprotaso]

/retest

[linkvt]

There are a few var/func names that still use endpoint or endpoints, we could update those to slices?

[dprotaso]

I don't think it's worth it - in the end we are looking at endpoints - whether that comes from corev1.Endpoints vs. discoveryv1.EndpointSlices shouldn't matter for these assertions