Revert https://github.com/knative-extensions/net-istio/pull/1085

[ReToCode]

Changes

• Reverts Add support for system-internal-tls in net-istio #1085
• Discussion see Add trusting a CA bundle to net-istio #1328 (comment)

Release Note

The experimental feature `system-internal-tls` was removed. Please use istio with service mesh to encrypt traffic between Knative components.

Closes #1328

[ReToCode]

/assign @dprotaso

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.10%. Comparing base (8aa5561) to head (2544718).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1344      +/-   ##
==========================================
- Coverage   82.25%   82.10%   -0.15%     
==========================================
  Files          26       25       -1     
  Lines        1668     1604      -64     
==========================================
- Hits         1372     1317      -55     
+ Misses        195      190       -5     
+ Partials      101       97       -4     

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[dprotaso]

/lgtm
/approve

[knative-prow]

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