Relax InternalValidate on the ID attribute

[paultyng]

As long as the the explicit schema of an ID attribute conforms to some specific values (maybe only type of string, unsure), it should be allowed to be overridden.

There are a few different use cases (document generation, LS, schema JSON), but mostly they stem from the fact that its always set to Optional + Computed even if its not actually optional for resource.

[ghost]

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