[WIP] CrossNamespace: e2e test to verify event delivery for broker and trigger

[yijie-04]

Fixes #7927

Proposed Changes

We should have an e2e test to verify that event delivery for broker and trigger when they are in different namespaces.

• 🎁 Add new feature

Pre-review Checklist

• At least 80% unit test coverage
• E2E tests for any new behavior
• Docs PR for any user-facing impact
• Spec PR for any new API feature
• Conformance test for any change to the spec

Release Note

Docs

[yijie-04]

/cc @Cali0707 @pierDipi

[pierDipi]

A different test structure could be to create 2 environments so that you don't need to create your namespaces

	brokerEnvCtx, brokerEnv := global.Environment(
		knative.WithKnativeNamespace(system.Namespace()),
		knative.WithLoggingConfig,
		knative.WithTracingConfig,
		k8s.WithEventListener,
		environment.Managed(t),
	)

	triggerEnvCtx, triggerEnv := global.Environment(
		knative.WithKnativeNamespace(system.Namespace()),
		knative.WithLoggingConfig,
		knative.WithTracingConfig,
		k8s.WithEventListener,
		environment.Managed(t),
	)

        brokerEnv.Test(brokerEnvCtx, t, broker.GoesReady(...))
        triggerEnv.Test(triggerEnvCtx, t, trigger.CrossNamespaceEventLink(brokerEnvCtx, ...))

[codecov]

Codecov Report

Attention: Patch coverage is 8.82353% with 31 lines in your changes missing coverage. Please review.

Project coverage is 67.62%. Comparing base (c60bcd0) to head (8c07a7a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/broker/filter/filter_handler.go	8.82%	30 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7933      +/-   ##
==========================================
- Coverage   67.68%   67.62%   -0.06%     
==========================================
  Files         354      354              
  Lines       16524    16539      +15     
==========================================
+ Hits        11184    11185       +1     
- Misses       4650     4665      +15     
+ Partials      690      689       -1     

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[pierDipi]

/test reconciler-tests

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: yijie-04
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[Cali0707]

/test reconciler-tests

Looks like the last failure was at least partially due to infra problems

[knative-prow]

@yijie-04: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
reconciler-tests_eventing_main	8c07a7a	link	true	/test reconciler-tests

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