tests: remove patching of a private ops class

[tonyandrewmeyer]

The tests currently patch a private ops class. The private names have no compatibility guarantees, and this will break in an upcoming ops release.

Remove the patching, which is generally not required with modern ops, and update a couple of expected IPs to the default ones (rather than Cloudflare's DNS server, which we should not really use anyway).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.81%. Comparing base (f9032b8) to head (4de5a03).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #617   +/-   ##
=======================================
  Coverage   70.81%   70.81%           
=======================================
  Files          12       12           
  Lines        3039     3039           
  Branches      537      537           
=======================================
  Hits         2152     2152           
  Misses        771      771           
  Partials      116      116           

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