Backward compatibility for InternalEncryption

[davidhadas]

Ensure that if someone uses the deprecated InternalEncryption, we use Dataplane-trust=Minimal as a minimum.
InternalEncryption is deprecated but will take time to remove from dependencies

[nak3]

@davidhadas Could you fix the unit test?

[nak3]

And this must be merged after knative/serving#13969 ?

[davidhadas]

And this must be merged after #13969

The idea was to merge before it actually :)
The intention is to ensure that when we merge #13969, and a cluster has InternalEncryption=true, we will behave as well as we already do today.

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02 🎉

Comparison is base (77975a1) 94.57% compared to head (f1dfc74) 94.59%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #806      +/-   ##
==========================================
+ Coverage   94.57%   94.59%   +0.02%     
==========================================
  Files          41       41              
  Lines        1253     1259       +6     
==========================================
+ Hits         1185     1191       +6     
  Misses         56       56              
  Partials       12       12              

Impacted Files	Coverage Δ
pkg/config/config.go	84.94% <100.00%> (+0.50%)	⬆️

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[nak3]

/lgtm
/approve
/hold

Thank you! Okay, please unhold this when the good timing.

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidhadas, nak3

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[davidhadas]

/unhold
This change will be useful once we start changing InternalEncryption across Serving packages to DataPlane-Trust. It will ensure that if InternalEncryption=true, such changes will not affect us by having some of the packages controlled by InternalEncryption and some by DataPlane-Trust.