Use resource_ref for upstream in stream_checking_resource_adaptor

[harrism]

Description

As we move toward replacing all device_memory_resource pointers with resource_refs, there are some places that changes can be made ahead of RMM to simplify required changes as RMM is refactored.

In this PR I eliminate the unnecessary Upstream template parameter from cudf_test::stream_checking_resource_adaptor, and use a device_async_resource for the upstream resource. A similar change will be made to all RMM resource adaptors, but this one can be done without deprecations since it is just a test utility.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.