Deprecate $variables['view'] for node.html.twig

Problem/Motivation

Views module adds $variables['view'] to node templates.

This is impossible to provide cacheable metadata for, because we don't have the render context of the view. I've also never seen it used.

We should deprecate it in 11.1.0 for removal in 12.0.0

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet