[release-0.22] [Consolidated] Rewrote the dispatcher reconciler

[knative-prow-robot]

This is an automated cherry-pick of #509

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[devguyio]

/lgtm

[slinkydeveloper]

@googlebot I consent.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.22@2e59cf5). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             release-0.22     #518   +/-   ##
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  Coverage                ?   73.47%           
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  Files                   ?      147           
  Lines                   ?     5753           
  Branches                ?        0           
===============================================
  Hits                    ?     4227           
  Misses                  ?     1282           
  Partials                ?      244           

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[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: devguyio, matzew

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