Cherry pick 1534 to release 1.11

[aliok]

Manual cherrypick of #1534 as automated cherrypick failed: #1535

Add more env vars for pingsource adapter env var preservation to prevent the eventing-controller and the operator fighting to set env var values.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7ef32df) 79.22% compared to head (f57448c) 79.22%.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.11    #1536   +/-   ##
=============================================
  Coverage         79.22%   79.22%           
=============================================
  Files                40       40           
  Lines              1800     1800           
=============================================
  Hits               1426     1426           
  Misses              272      272           
  Partials            102      102           

Files Changed	Coverage Δ
...knativeeventing/common/replicasenvvarstransform.go	70.58% <ø> (ø)

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[creydr]

/lgtm

[knative-prow]

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