The product custom resource is sometimes mentionned as {product} custom resource, sometimes `Backstage` custom resource.

As the custom resource `type` value is `Backstage`, and not `RHDH` or `Developer Hub`, it makes sense to choose to always refer to "your `Backstage` custom resource".

We have introduced an attribute to define it:

:product-custom-resource-type: Backstage

Replace the various mentions by a more consistent:

your `{product-custom-resource-type}` custom resource