Description

Follow-up from twigphp/Twig#3869

Since app.cache.tagware exists by default, we should not allow app.cache to be taggable. Whenever people try to configure app.cache as taggable we should inform them about app.cache.taggable.

Ideally, in the current version this would raise a deprecation notice, and it should be completely forbidden in the next Symfony version.

Example

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