Handle nested paragraphs in 'Page entity label' Views field

The 'Page entity label' Views field conveniently checks the type of the entity containing the link and if it's a paragraph, displays the label of the paragraph's parent, and also links to it if there is a canonical link.

Unfortunately this doesn't handle nested paragraphs - e.g. a paragraph within a paragraphs field (e.g. some kind of container/layout paragraph). Patch attached continues getting paragraph parents while they're available, until the root parent is obtained (which will usually be of a type with a canonical link).