[release-1.15] For satefulset kafka dispatchers we ignore the replica

[knative-prow-robot]

This is an automated cherry-pick of #1889

statefulset kafka dispatcher have a managed scaling via kafka controller, hence we ignore replica on those

[codecov]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 66.31%. Comparing base (69e97a2) to head (ed766e3).
Report is 1 commits behind head on release-1.15.

Files with missing lines	Patch %	Lines
pkg/reconciler/common/workload_override.go	50.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@               Coverage Diff                @@
##           release-1.15    #1891      +/-   ##
================================================
- Coverage         66.36%   66.31%   -0.05%     
================================================
  Files                53       53              
  Lines              2081     2084       +3     
================================================
+ Hits               1381     1382       +1     
- Misses              586      587       +1     
- Partials            114      115       +1     

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[matzew]

/lgtm
/approve

[matzew]

/lgtm
/approve

[knative-prow]

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