Removes standalone broker

[gab-satchi]

Changes

• 🗑️ removes deprecated standalone broker
• removes controller, CRDs and reconcilers
• removes relevant make targets
• removes relevant GitHub actions

Since it's a large PR, will send out doc changes in a follow-up PR

/kind removal

Fixes #627

Release Note

- Remove support for managed RabbitMQ brokers

[codecov]

Codecov Report

Merging #708 (9516a6a) into main (a93b956) will increase coverage by 0.23%.
The diff coverage is 76.92%.

@@            Coverage Diff             @@
##             main     #708      +/-   ##
==========================================
+ Coverage   75.08%   75.31%   +0.23%     
==========================================
  Files          47       31      -16     
  Lines        2910     2346     -564     
==========================================
- Hits         2185     1767     -418     
+ Misses        585      515      -70     
+ Partials      140       64      -76     

Impacted Files	Coverage Δ
pkg/apis/sources/v1alpha1/rabbitmq_defaults.go	0.00% <0.00%> (ø)
pkg/apis/sources/v1alpha1/rabbitmq_types.go	50.00% <0.00%> (ø)
pkg/rabbit/service.go	0.00% <0.00%> (ø)
pkg/reconciler/broker/broker_test_helper.go	80.31% <ø> (+0.31%)	⬆️
pkg/reconciler/trigger/trigger.go	60.93% <41.26%> (+0.70%)	⬆️
pkg/adapter/adapter.go	58.50% <70.00%> (-8.49%)	⬇️
pkg/rabbit/label.go	93.75% <93.75%> (ø)
pkg/adapter/message.go	90.10% <100.00%> (-0.52%)	⬇️
pkg/apis/eventing/v1/trigger_validation.go	71.11% <100.00%> (-0.77%)	⬇️
pkg/apis/sources/v1alpha1/rabbitmq_validation.go	60.60% <100.00%> (-1.30%)	⬇️
... and 42 more

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[ChunyiLyu]

LGTM

[knative-prow]

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