[release-0.24] Make status.address optional in the KafkaChannel CRD

[knative-prow-robot]

This is an automated cherry-pick of #857

- 🐛 Fix bug: `status.address` of KafkaChannel is not required anymore, thus conditions are reflected successfully in case of an early stage error

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[pierDipi]

/cc aliok

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.24@778680a). Click here to learn what that means.
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@@               Coverage Diff               @@
##             release-0.24     #869   +/-   ##
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  Branches                ?        0           
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  Hits                    ?     4615           
  Misses                  ?     1342           
  Partials                ?      224           

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[matzew]

/retest

[aliok]

@googlebot I consent.

[aliok]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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