[release-1.6] Tests for encryption with Kourier local gateway

[knative-prow-robot]

This is an automated cherry-pick of #13263

[knative-prow]

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[codecov]

Codecov Report

Merging #13277 (196bff9) into release-1.6 (3666ce7) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           release-1.6   #13277   +/-   ##
============================================
  Coverage        86.80%   86.80%           
============================================
  Files              196      196           
  Lines            14410    14410           
============================================
  Hits             12509    12509           
  Misses            1607     1607           
  Partials           294      294           

Impacted Files	Coverage Δ
pkg/reconciler/revision/background.go	89.09% <0.00%> (-1.82%)	⬇️
pkg/autoscaler/statforwarder/leases.go	73.95% <0.00%> (+1.56%)	⬆️

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[mgencur]

/lgtm
/assign @nak3

[nak3]

This PR adds the "new test" code/script. I wonder that we should not backport it as it will cut a new 1.6.x branch and make confusion for users.

@mgencur It is not OK to backport it on downstream only?

[mgencur]

OK. It's probably fine to backport downstream only.