Add a ConsumerGroup filter function based on owner refs

[pierDipi]

Every user-facing resource keeps track of the associated
ConsumerGroup resources.

This patch adds a generic filter function to be used by
KafkaSource, Trigger, and KafkaChannel reconciler.

Part of #1537

Proposed Changes

• Add a ConsumerGroup filter function

Release Note

None

Docs

None

[knative-metrics-robot]

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

File	Old Coverage	New Coverage	Delta
control-plane/pkg/reconciler/consumergroup/filter.go	Do not exist	100.0%
control-plane/pkg/reconciler/trigger/v2/controllerv2.go	34.1%	38.9%	4.7

[knative-prow-robot]

@pierDipi: 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
pull-knative-sandbox-eventing-kafka-broker-go-coverage	697161b	link	false	/test pull-knative-sandbox-eventing-kafka-broker-go-coverage

Full PR test history. Your PR dashboard.

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[codecov]

Codecov Report

Merging #1615 (697161b) into main (2e8d011) will decrease coverage by 0.67%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1615      +/-   ##
============================================
- Coverage     73.12%   72.44%   -0.68%     
  Complexity      597      597              
============================================
  Files           118      120       +2     
  Lines          4375     4424      +49     
  Branches        171      171              
============================================
+ Hits           3199     3205       +6     
- Misses          911      954      +43     
  Partials        265      265              

Flag	Coverage Δ
java-unittests	81.90% <ø> (ø)

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Impacted Files	Coverage Δ
...ntrol-plane/pkg/reconciler/consumergroup/filter.go	100.00% <100.00%> (ø)
...ol-plane/pkg/reconciler/trigger/v2/controllerv2.go	57.69% <100.00%> (+7.69%)	⬆️
control-plane/pkg/prober/prober.go	60.00% <0.00%> (-15.00%)	⬇️
control-plane/pkg/prober/cache.go	95.23% <0.00%> (-4.77%)	⬇️
...lane/pkg/reconciler/consumergroup/consumergroup.go	0.00% <0.00%> (ø)

---

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[aavarghese]

/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aavarghese, pierDipi

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