Channel to use new configmap format for bootstrap servers

[aliok]

Fixes #

Proposed Changes

• Channel to use new configmap format for bootstrap servers
• Nothing else is used from configmap at this moment (no auth etc.)

Release Note

Docs

[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/channel/channel.go	77.3%	77.2%	-0.1
control-plane/pkg/reconciler/kafka/topic.go	94.9%	84.8%	-10.1

[codecov]

Codecov Report

Merging #1558 (f630a8d) into main (1a38db0) will decrease coverage by 0.21%.
The diff coverage is 48.00%.

@@             Coverage Diff              @@
##               main    #1558      +/-   ##
============================================
- Coverage     75.21%   75.00%   -0.22%     
  Complexity      592      592              
============================================
  Files           107      107              
  Lines          4124     4136      +12     
  Branches        170      170              
============================================
  Hits           3102     3102              
- Misses          764      776      +12     
  Partials        258      258              

Flag	Coverage Δ
java-unittests	82.06% <ø> (ø)

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Impacted Files	Coverage Δ
control-plane/pkg/reconciler/kafka/topic.go	80.68% <7.69%> (-12.74%)	⬇️
control-plane/pkg/reconciler/channel/channel.go	58.20% <91.66%> (ø)

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[pierDipi]

/lgtm

Great to see this consolidation!

[pierDipi]

🤦‍♂️

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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