Drop usage of `eventing.knative.dev/release`

[liuchangyan]

Fixes #6383

Proposed Changes

• Removing deprecated eventing.knative.dev/release label

Pre-review Checklist

• [ ] At least 80% unit test coverage
• [ ] E2E tests for any new behavior
• [ ] Docs PR for any user-facing impact
• [ ] Spec PR for any new API feature
• [ ] Conformance test for any change to the spec

Release Note

'eventing.knative.dev/release' labels, deprecated in v1.3, have been removed. Switch it to using `app.kubernetes.io/name: knative-eventing` and `app.kuberentes.io/version: devel`.

[knative-prow[bot]]

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[codecov[bot]]

Codecov Report

Merging #6488 (9925293) into main (cb3901f) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #6488   +/-   ##
=======================================
  Coverage   82.16%   82.16%           
=======================================
  Files         235      235           
  Lines       11700    11700           
=======================================
  Hits         9613     9613           
  Misses       1620     1620           
  Partials      467      467           

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[pierDipi]

@houshengbo are you using this label in the operator?

[matzew]

/hold

let's not yet merge this a day before a release

[pierDipi]

ping @houshengbo

[github-actions[bot]]

This Pull Request is stale because it has been open for 90 days with no activity. It will automatically close after 30 more days of inactivity. Reopen with /reopen. Mark as fresh by adding the comment /remove-lifecycle stale.