[FrameworkBundle] Mark cache.default_*_provider services private #20577
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I know making a service private has a potential for breaking BC. Yet, these services should not be used directly in controllers/userland code, and I really doubt anyone did. Let's make it private now and fix linked issue (even if it's a false positive from SymfonyServiceDefinitionValidator, it shows we have this service that really isn't meant to be public).