Upgrade to eventing v1 apis and eventing 0.22

[grantr]

Alternate, smaller-scope version of #2197, upgrading to 0.22 instead of head (0.23).

The v1beta1 versions of Broker and Trigger have been removed from upstream. The v1 version has an identical schema, so replacing is just import juggling.

This should unblock the auto dependency update.

Proposed Changes

• 🗑️ Remove support for Broker and Trigger v1beta1

[knative-metrics-robot]

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

File	Old Coverage	New Coverage	Delta
pkg/apis/broker/v1/broker_defaults.go	Do not exist	86.7%
pkg/apis/broker/v1/broker_lifecycle.go	Do not exist	100.0%
pkg/apis/broker/v1/broker_types.go	Do not exist	100.0%
pkg/apis/broker/v1/broker_validation.go	Do not exist	100.0%
pkg/apis/broker/v1/register.go	Do not exist	100.0%
pkg/apis/broker/v1/test_helper.go	Do not exist	96.2%
pkg/apis/broker/v1/trigger_defaults.go	Do not exist	100.0%
pkg/apis/broker/v1/trigger_lifecycle.go	Do not exist	94.7%
pkg/apis/broker/v1/trigger_types.go	Do not exist	100.0%
pkg/apis/broker/v1/trigger_validation.go	Do not exist	100.0%
pkg/apis/convert/conversion_helper.go	96.4%	97.3%	0.9

[tommyreddad]

/test pull-google-knative-gcp-wi-tests

[zhongduo]

/lgtm
/approve

[knative-prow-robot]

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