fix: add "none" as identity provider

[roee-hersh]

identity provider: "none" is officially supported and allowed value based on the docs and keda golang structs:

https://github.com/kedacore/keda/blob/main/apis/keda/v1alpha1/triggerauthentication_types.go#L123

const (
	PodIdentityProviderNone          PodIdentityProvider = "none"
	PodIdentityProviderAzure         PodIdentityProvider = "azure"
	PodIdentityProviderAzureWorkload PodIdentityProvider = "azure-workload"
	PodIdentityProviderGCP           PodIdentityProvider = "gcp"
	PodIdentityProviderAwsEKS        PodIdentityProvider = "aws-eks"
	PodIdentityProviderAwsKiam       PodIdentityProvider = "aws-kiam"
	PodIdentityProviderAws           PodIdentityProvider = "aws"
)

and in the docs:
https://keda.sh/docs/2.13/concepts/authentication/

apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
  name: {trigger-authentication-name}
  namespace: default # must be same namespace as the ScaledObject
spec:
  podIdentity:
      provider: none | azure | azure-workload | aws | aws-eks | aws-kiam | gcp  # Optional. Default: none
...

its missing since crds refactor (2.13)

Checklist

• I have verified that my change is according to the deprecations & breaking changes policy
• Commits are signed with Developer Certificate of Origin (DCO - learn more)
• README is updated with new configuration values (if applicable) learn more
• A PR is opened to update KEDA core (repo) (if applicable, ie. when deployment manifests are modified)

[JorTurFer]

Nice catch!
Although you just keep it unset, it's also true that none should be accepted based on docs. I've opened a PR into KEDA code to reflect this change too: kedacore/keda#5593

[JorTurFer]

We need to include this change in multiple places (in the same places as the core PR), could you update all of them? 🙏

[JorTurFer]

Thanks for your contribution! ❤️