Set CORS policy values only for when HTTPProxy associated with external visibility

[izabelacg]

Changes

• 🧹 Currently, when setting CORS policy in config-contour, all HTTPProxies are modified to include the CORS settings.
  This PR modifies the code to set CORS policy values only for when HTTPProxy is associated with external visibility.
• add test to confirm CORS policy settings are not included in HTTPProxy resources with cluster local visibility.

/kind cleanup

Apply CORS policy on external routes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.92%. Comparing base (820cd7c) to head (f8bacc3).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1088      +/-   ##
==========================================
- Coverage   94.06%   93.92%   -0.14%     
==========================================
  Files          11       11              
  Lines         893      708     -185     
==========================================
- Hits          840      665     -175     
+ Misses         32       22      -10     
  Partials       21       21              

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[ReToCode]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[dprotaso]

/cherry-pick release-1.14

[knative-prow-robot]

@dprotaso: new pull request created: #1089

In response to this:

/cherry-pick release-1.14

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