enable system internal tls for contour

[dprotaso]

Depends on knative-extensions/net-contour#1110

/hold

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.58%. Comparing base (b0eab7d) to head (de24cab).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15374   +/-   ##
=======================================
  Coverage   84.58%   84.58%           
=======================================
  Files         219      219           
  Lines       13584    13584           
=======================================
  Hits        11490    11490           
- Misses       1726     1727    +1     
+ Partials      368      367    -1     

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[dprotaso]

/test contour-latest_serving_main
/test contour-tls_serving_main

[dprotaso]

'All cluster resources were brought up, but: only 10 nodes out of 12 have registered;

/retest

[dprotaso]

/hold cancel

/assign @ReToCode

[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dprotaso, ReToCode

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