Allow get composed resource with dots in name

[twobiers]

What happened?

When trying to get a composed resource with dots in the name, it does not work.

How can we reproduce it?

apiVersion: apiextensions.crossplane.io/v1
kind: Composition
metadata:
  name: example-function-get-composed-resource
spec:
  compositeTypeRef:
    apiVersion: example.crossplane.io/v1beta1
    kind: XR
  mode: Pipeline
  pipeline:
    - step: render-templates
      functionRef:
        name: function-go-templating
      input:
        apiVersion: gotemplating.fn.crossplane.io/v1beta1
        kind: GoTemplate
        source: Inline
        inline:
          template: |
            ---
            {{ $flexServerResourceName := "flex.server" }}
            # Create an initial composed resource for which we will retrieve a value
            apiVersion: dbforpostgresql.azure.upbound.io/v1beta1
            kind: FlexibleServer
            metadata:
              annotations:
                {{ setResourceNameAnnotation $flexServerResourceName }}
                gotemplating.fn.crossplane.io/ready: "False"
            spec:
              forProvider:
                storageMb: 32768
              providerConfigRef:
                name: my-provider-cfg
            ---
            # Use getComposedResource to retrieve the observed resource named "flexServer"
            {{ $flexServer := getComposedResource . $flexServerResourceName }}
            
            apiVersion: dbforpostgresql.azure.upbound.io/v1beta1
            kind: FlexibleServerConfiguration
            metadata:
              annotations:
                {{ setResourceNameAnnotation "flexServerConfig" }}
                gotemplating.fn.crossplane.io/ready: "False"
            spec:
              forProvider:
                # Populate the field using the observed status of the retrieved resource
                serverId: {{ get $flexServer.status "id" }}

              providerConfigRef:
                name: my-provider-cfg

What environment did it happen in?

Function version: 0.8.0