Removes secret type for brokerConfig

[gab-satchi]

• 🗑️ Secret kind removed as a valid Broker config. Only RabbitmqCluster is supported

/kind removal

Release Note

- With the removal of standalone-broker, Secret type is no longer a supported Broker.Config

[codecov]

Codecov Report

Merging #773 (8199576) into main (41df0b6) will increase coverage by 0.49%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #773      +/-   ##
==========================================
+ Coverage   74.84%   75.33%   +0.49%     
==========================================
  Files          35       35              
  Lines        2544     2526      -18     
==========================================
- Hits         1904     1903       -1     
+ Misses        576      559      -17     
  Partials       64       64              

Impacted Files	Coverage Δ
pkg/apis/eventing/v1/broker_validation.go	83.11% <100.00%> (-0.22%)	⬇️
pkg/reconciler/broker/broker_config.go	91.66% <100.00%> (+17.50%)	⬆️

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[knative-prow]

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