Fix Kourier bootstrap namespace

[kahirokunn]

Fixes #

Proposed Changes

• Use the Kourier bootstrap ConfigMap namespace to replace the default namespace embedded in its Envoy bootstrap configuration.
• Handle the raw ConfigMap data that the common namespace transformer cannot update, following the existing replaceGatewayNamespace pattern.
• Add regression coverage for installing Knative Serving outside the knative-serving namespace.

Release Note

Fix Kourier connectivity when Knative Serving is installed in a non-default namespace.

[knative-prow]

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[knative-prow]

@kahirokunn: 0 warnings.

Details

In response to this:

Fixes #

Proposed Changes

• Use the Kourier bootstrap ConfigMap namespace to replace the default namespace embedded in its Envoy bootstrap configuration.
• Handle the raw ConfigMap data that the common namespace transformer cannot update, following the existing replaceGatewayNamespace pattern.
• Add regression coverage for installing Knative Serving outside the knative-serving namespace.

Release Note

Fix Kourier connectivity when Knative Serving is installed in a non-default namespace.

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[codecov]

Codecov Report

❌ Patch coverage is 83.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.99%. Comparing base (8f00498) to head (999ba3a).

Files with missing lines	Patch %	Lines
pkg/reconciler/knativeserving/ingress/kourier.go	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2336      +/-   ##
==========================================
+ Coverage   63.89%   63.99%   +0.09%     
==========================================
  Files          55       55              
  Lines        2479     2491      +12     
==========================================
+ Hits         1584     1594      +10     
- Misses        776      777       +1     
- Partials      119      120       +1     

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[kahirokunn]

/ok-to-test