Add auth for ACR to aks_applications

[brk3]

This patch allows the use of ACR as a repository for helm charts.

Example usage:

helm_charts = {
  mychart = {
    name       = "mychart"
    chart      = "mychart"
    namespace  = "default"
    version    = "0.0.1"

    azure_container_registry = {
      lz_key   = "devops"
      key      = "devops_acr"
      username = "00000000-0000-0000-0000-000000000000"
    }
  }
}

Note, the version bump of the helm provider is for the recently added
oci support: hashicorp/terraform-provider-helm#666

PR Checklist

---

• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My code follows the code style of this project.
• I ran lint checks locally prior to submission.
• Have you checked to ensure there aren't other open Pull Requests for the same update/change?

Description

Does this introduce a breaking change

• YES
• NO

Testing

[hieumoscow]

What a great add @brk3, I have a slight concern that the ACR access token might be persisted in tfstate. And wonder if we can make this agnostic to OCI registries.
But LGTM for this add, thank you a lot for your contribution

[brk3]

Thanks for reviewing @hieumoscow.

I guess the token will end up in the state, though this is the same as many other resources in CAF? My understanding is it's assumed the state file must be secured for this reason. Unless there's another pattern for supplying the token that you could point me to?

In the mean time I'll work on making it more provider agnostic 👍