Mezmo Terraform provider: HTTP shared_source does not export endpoint

They were splitting one complex Mezmo pipeline into several pipelines sharing a single HTTP sharedsource. With single HTTP sources they could build the endpoint URL for their log forwarder from the pipeline ID, but the sharedsource's ID is not the value that ends up in the final shared-source endpoint. Nothing in Terraform state exposed the endpoint either, so they had to create the shared source and then manually copy the endpoint URL into the log forwarder. They asked whether any Terraform attribute could give them the endpoint dynamically.