StringFormatter does not support entity uri_callback

Problem/Motivation

Spotted this as the original author of 🐛 StringFormatter always displays links to entity even if the user in context does not have access Needs work and a contributor to [##3386313]. It looks like EntityReferenceLabelFormatter supports entity uri_callback because it does not check whether the entity type or the entity has a canonical link template, but the StringFormatter does, therefore it does not support it.

But uri_callback are scheduled to be removed... so killing them could also fix this problem. See: 📌 [meta] convert ‘uri_callback’ entities param to EntityInterface::uri() method Active

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