Prettify printing of webhook warnings

[markusthoemmes]

Description

Adds a proper warning printer to have warnings being printed in a similar format as "other messages". Color could be easily supported but it seemed like kn doesn't color in general. Let me know if that aint the case.

Changes

Output before:

W0624 13:35:20.413073  372781 warnings.go:70] This is a test!
Replacing service 'foo' in namespace 'default':
...

Output after:

Warning: This is a test!
Replacing service 'foo' in namespace 'default':
...

Reference

Fixes #1350

[knative-prow-robot]

@markusthoemmes: 0 warnings.

In response to this:

Description

Adds a proper warning printer to have warnings being printed in a similar format as "other messages". Color could be easily supported but it seemed like kn doesn't color in general. Let me know if that aint the case.

Changes

Output before:

W0624 13:35:20.413073  372781 warnings.go:70] This is a test!
Replacing service 'foo' in namespace 'default':
...

Output after:

Warning: This is a test!
Replacing service 'foo' in namespace 'default':
...

Reference

Fixes #1350

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[markusthoemmes]

/assign @rhuss @dsimansk

[codecov]

Codecov Report

Merging #1353 (b54c584) into main (46297a7) will decrease coverage by 0.02%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #1353      +/-   ##
==========================================
- Coverage   72.96%   72.94%   -0.03%     
==========================================
  Files         160      160              
  Lines        8083     8086       +3     
==========================================
  Hits         5898     5898              
- Misses       1463     1466       +3     
  Partials      722      722              

Impacted Files	Coverage Δ
cmd/kn/main.go	40.00% <0.00%> (-60.00%)	⬇️

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[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-client-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
cmd/kn/main.go	75.7%	74.6%	-1.1

[rhuss]

thanks !

Looks good to me, but not sure how make codecov happy. I don't think codecov is a mandatory check, so lets try to merge it.

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markusthoemmes, rhuss

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