allow unknown fields in our webhooks since our CRD schemas are now specified

[dprotaso]

Fixes #11980

Proposed Changes

• allow unknown fields in our webhooks since our CRD schemas are now specified in (See if it's possible to drop x-kubernetes-preserve-unknown-fields #11980)

Release Note

Our webhooks no longer reject unknown fields since they're pruned by the K8s API server

[codecov]

Codecov Report

Merging #13111 (b465851) into main (838305e) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main   #13111      +/-   ##
==========================================
- Coverage   86.78%   86.75%   -0.04%     
==========================================
  Files         197      197              
  Lines       14485    14485              
==========================================
- Hits        12571    12566       -5     
- Misses       1619     1623       +4     
- Partials      295      296       +1     

Impacted Files	Coverage Δ
pkg/reconciler/revision/reconcile_resources.go	66.88% <0.00%> (-1.99%)	⬇️
pkg/autoscaler/scaling/multiscaler.go	87.24% <0.00%> (-1.35%)	⬇️

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[dprotaso]

/assign @psschwei

[psschwei]

/lgtm
/approve
/hold
for #13095

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[psschwei]

/hold cancel