Add conformance test for invokes, custom, and component resources running against a provider that has unknown config

From slack:

approved https://github.com/pulumi/pulumi/pull/24108 but I think we want another conformance test here for invokes, custom, and component resources when running against a provider that has unknown config. Currently we just return empty maps for those which is so so so wrong. We should make use of the new unknown bits on invoke response and register resource to just return them as fully unknown at preview time. You'll want to test custom register, custom read, component register, invokes, and calls.