Set correct namespace for namespace reconciliation events

[devguyio]

Namespace events created during reconciliation end up in default namespace. This gives a bad and unexpected UX for Eventing users since in our case, the user is interacting with Triggers and Brokers that are in a specific namespace and expects Events being there.

Fixes #3084

Proposed Changes

• Enforcing namespace for namespace reconciliation events with regards to broker creation.

Release Note

When default broker is created via namespace reconciler, the Kubernetes events will be created in the correct namespace instead of some of them getting created in default namespace.

[devguyio]

/assign @grantr

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-knative-eventing-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/reconciler/mtnamespace/namespace.go	82.4%	83.3%	1.0

[lberk]

/assign

[n3wscott]

/lgtm
/approve

[devguyio]

/honk

[devguyio]

/woof

[knative-prow-robot]

@Abd4llA:

In response to this:

/woof

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[devguyio]

/hold

[devguyio]

/unhold

[pierDipi]

/uncc slinkydeveloper
/uncc vaikas
/lgtm
/approve

[matzew]

/honk

/honk

[matzew]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Abd4llA, matzew, n3wscott, pierDipi

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[chizhg]

/retest