fix(core): Annotations are not handled correctly

[tomkerkhove]

Annotations are optional but enforced

• additionalAnnotations are optional but enforced
• additionalAnnotations & service.additionalAnnotations are not rendered correctly wrt whitespace
• toYaml drops quoting
• additionalAnnotations & service.additionalAnnotations was not supported in webhooks
• CI did not use these annotations during tests

Checklist

• Commits are signed with Developer Certificate of Origin (DCO - learn more)

Fixes #481

[tomkerkhove]

Testing input:

nodeSelector:
  some/node.selector: 'true'
podIdentity:
  azureWorkload:
    clientId: ''
    enabled: true
prometheus:
  metricServer:
    enabled: true
  operator:
    enabled: true
    port: 8080
  webhooks:
    enabled: true
additionalAnnotations:
  sample: "annotation"
service:
  annotations:
    hello: "world yall"

Output

$ helm install keda --values D:\Code\sandbox\keda-sandbox\values.yml --dry-run --generate-name
NOTES:
=====================================================================================
KEDA - Kubernetes Event Driven Autoscaling
=====================================================================================
Get started by deploying Scaled Objects to your cluster:
    - Information about Scaled Objects : https://keda.sh/docs/latest/concepts/
    - Samples: https://github.com/kedacore/samples

Get information about the deployed ScaledObjects:
  kubectl get scaledobject [--namespace <namespace>]

Get details about a deployed ScaledObject:
  kubectl describe scaledobject <scaled-object-name> [--namespace <namespace>]

Get information about the deployed ScaledObjects:
  kubectl get triggerauthentication [--namespace <namespace>]

Get details about a deployed ScaledObject:
  kubectl describe triggerauthentication <trigger-authentication-name> [--namespace <namespace>]

Get an overview of the Horizontal Pod Autoscalers (HPA) that KEDA is using behind the scenes:
  kubectl get hpa [--all-namespaces] [--namespace <namespace>]

-------------------------------------------------------------------------------------

For more information on running KEDA, visit:
https://github.com/kedacore/keda/
=====================================================================================