Remove an old restriction on _ObjectiveCBridgeable
conformances.
#71426
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Historically, we checked against a specific allowlist for a certain set of types that were allowed to introduce an
_ObjectiveCBridgeable
conformance in a different module that where the type was defined. This rigid allow-list isn't really buying us much, but it's getting in the way of some refactoring for swift-foundation that's changing the layering. Remove this diagnostic, since it really isn't buying us much nowadays, and we have the more general warnings about retroactive conformances to make folks think twice.