ComponentSourceInterface::inputToClientModel needs to support passing an entity

@lauriii We will need this for content templates to show the actual dynamic values. I have put a temporary fix in the spike MR https://git.drupalcode.org/project/experience_builder/-/merge_requests/1...

So if templates are a stable we will need this

#6++ — which is why this is tagged for 🌱 [META] 7. Content type templates — aka "default layouts" — clarify the tree+props data model Active . 👍

(It's not a stable blocker in and of itself is what Lauri meant — but it is a blocker for #3455629.)