Schedule a re-review of the RpcClient unit test

[gregmedd]

We did not give it a thorough reading through given the time available during the initial PR. While we are fairly confident the test is fine, it should still receive a full review and approval. Make a PR that simulates re-adding the test so that we can give it a full review.

Originally posted by @gregmedd in https://github.com/eclipse-uprotocol/up-cpp/pull/202#discussion_r1674743230