Service requester starting before responder causes timeout when both are in the same process

[azeey]

Environment

• OS Version: Ubuntu 22.04
• Source or binary build? source, 764a04b

Description

• Expected behavior: When the node of a service requester is started before the node of a responder, the service request should succeed as long as the responder is started before the requester's timeout.
• Actual behavior: Currently, if the requester and responder are in different processes, the expected behavior occurs, but if they are in the same process, the requester will always time out.

Steps to reproduce

1. Checkout the flaky_service branch from https://github.com/azeey/gz-transport/
2. Build examples/requester.cc and run it.

The example shows that if the responder is started with a 2s delay in a separate thread, the request fails.