Remove domainmapping config

[nak3]

As per title, this was removed since fc166ac

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.06 🎉

Comparison is base (4c76e3b) 86.21% compared to head (54b1609) 86.27%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14161      +/-   ##
==========================================
+ Coverage   86.21%   86.27%   +0.06%     
==========================================
  Files         199      199              
  Lines       14811    14811              
==========================================
+ Hits        12769    12778       +9     
+ Misses       1737     1732       -5     
+ Partials      305      301       -4     

see 2 files with indirect coverage changes

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[ReToCode]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nak3, ReToCode

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