Add autoscaler-keda configmap

[skonto]

Changes

• Adds a dedicated cm to configure global properties.
• Tested locally by changing the prometheus address and then checking if the related scaledObject spec is updated.
• Cleans up cm deps. For now wrt changes we care about the Serving autoscaler cm and the autoscaler keda one.
• Fixes the scaledobject update logic in the reconciler, previously this would fail due to not properly copying before updating.

Fixes #21

Release Note

Add autoscaler-keda configmap 

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 76.59574% with 11 lines in your changes missing coverage. Please review.

Project coverage is 66.07%. Comparing base (e650989) to head (2319416). Report is 38 commits behind head on main.

Files with missing lines	Patch %	Lines
...conciler/autoscaling/hpa/config/autoscaler_keda.go	60.00%	3 Missing and 3 partials :warning:
pkg/reconciler/autoscaling/hpa/keda_hpa.go	40.00%	3 Missing :warning:
pkg/reconciler/autoscaling/hpa/resources/keda.go	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #27 +/- ## ========================================== + Coverage 63.63% 66.07% +2.44% ========================================== Files 4 6 +2 Lines 187 227 +40 ========================================== + Hits 119 150 +31 - Misses 60 66 +6 - Partials 8 11 +3 ```

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[knative-prow[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ReToCode, skonto

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