test: triggers scale with KEDA

[Cali0707]

Fixes #3238

Proposed Changes

• Refactor consumergroup scale checks to be more generic
• Add a test that verifies that triggers scale up and down

Release Note

The kafka-broker-dispatcher StatefulSet now scales with KEDA if you enable the controller-autoscaler-keda feature flag

Docs

[Cali0707]

/cc @pierDipi

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.93%. Comparing base (de17c00) to head (62eeb3a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #3813   +/-   ##
=========================================
  Coverage     73.93%   73.93%           
- Complexity      875      876    +1     
=========================================
  Files           100      100           
  Lines          3407     3407           
  Branches        288      288           
=========================================
  Hits           2519     2519           
- Misses          714      715    +1     
+ Partials        174      173    -1     

Flag	Coverage Δ
java-unittests	73.93% <ø> (ø)

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[pierDipi]

/lgtm
/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Cali0707, pierDipi

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[pierDipi]

/retest-required

[Cali0707]

/retest-required