[release-1.3] Handle host headers in dataplane for identification of channel instances

[knative-prow-robot]

This is an automated cherry-pick of #1990

- :gift: Handle host headers in dataplane for identification of channel instances

[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-1.3@c73da6a). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release-1.3    #2036   +/-   ##
==============================================
  Coverage               ?   67.28%           
  Complexity             ?      640           
==============================================
  Files                  ?      141           
  Lines                  ?     6712           
  Branches               ?      187           
==============================================
  Hits                   ?     4516           
  Misses                 ?     1820           
  Partials               ?      376           

Flag	Coverage Δ
java-unittests	81.75% <0.00%> (?)

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[pierDipi]

/retest

[pierDipi]

/test unit-tests_eventing-kafka-broker_release-1.3