remove duplicate 'additionalPrinterColumns' in domain-mapping resource

[k4leung4]

Fixes #

Proposed Changes

• remove duplicate 'additionalPrinterColumns' in domain-mapping resource, was seeing

error: map[string]interface {}(nil): yaml: unmarshal errors:
  line 153: mapping key "additionalPrinterColumns" already defined at line 31

Release Note

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e473c4a) 86.00% compared to head (074a16d) 86.01%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14592      +/-   ##
==========================================
+ Coverage   86.00%   86.01%   +0.01%     
==========================================
  Files         197      197              
  Lines       14916    14916              
==========================================
+ Hits        12828    12830       +2     
+ Misses       1778     1775       -3     
- Partials      310      311       +1     

see 3 files with indirect coverage changes

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[dprotaso]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, k4leung4

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[dprotaso]

/cherry-pick release-1.12

[dprotaso]

/cherry-pick release-1.11

[knative-prow-robot]

@dprotaso: new pull request created: #14653

In response to this:

/cherry-pick release-1.12

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[knative-prow-robot]

@dprotaso: new pull request created: #14654

In response to this:

/cherry-pick release-1.11

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.