Improve ValidReferenceConstraint error messages by including bundle information

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I created a new Merge Request which implements the improvements proposed in the issue description.

I think this might work for some entity types, but not for all, one of the errors I see in the tests is this one: user_id.0.target_id=This·entity·(user·-·User:·2)·cannot·be·referenced.||flvpwaxl.0.format=The·value·you·selected·is·not·a·valid·choice.'

This reference (user - User: 2) doesn't seem to add any value and I think only adds confusion. At the very least this needs to be fixed so that users don't have the double reference.

For paragraphs, I see value in this.