Subscription.Spec.Channel now uses KReference

[slinkydeveloper]

Signed-off-by: Francesco Guardiani francescoguard@gmail.com

Fixes #5411

Proposed Changes

• 🧹 Subscription.Spec.Channel now uses KReference.
• 🐛 Now the spec.channel CRD schema is less permissive and matches the supported usage of KReference fields.

Pre-review Checklist

• At least 80% unit test coverage

Release Note

- :broom: Subscription.Spec.Channel now uses KReference and the spec.channel CRD schema is less permissive and matches the supported usage of KReference fields. Subscription's users creating their resources with YAMLs are not affected.

[codecov]

Codecov Report

Merging #5412 (8a98937) into main (0653ac4) will decrease coverage by 0.05%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main    #5412      +/-   ##
==========================================
- Coverage   82.68%   82.62%   -0.06%     
==========================================
  Files         194      194              
  Lines        6006     5987      -19     
==========================================
- Hits         4966     4947      -19     
  Misses        717      717              
  Partials      323      323              

Impacted Files	Coverage Δ
pkg/apis/messaging/v1/subscription_types.go	66.66% <ø> (ø)
pkg/reconciler/subscription/subscription.go	82.12% <66.66%> (ø)
...essaging/v1/subscribable_channelable_validation.go	100.00% <100.00%> (ø)
pkg/apis/messaging/v1/subscription_validation.go	85.00% <100.00%> (ø)
pkg/reconciler/broker/resources/subscription.go	100.00% <100.00%> (ø)

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[slinkydeveloper]

/test pull-knative-eventing-conformance-tests

[vaikas]

/lgtm
/approve

[knative-prow-robot]

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