[Bug] Experimental SignalWithStart inside a workflow has empty serialization context

[tconley1428]

What are you really trying to do?

If a user wants a context aware data converter, the serialization context will be empty for this operation.

Describe the bug

Minimal Reproduction

Environment/Versions

• OS and processor: [e.g. M1 Mac, x86 Windows, Linux]
• Temporal Version: [e.g. 1.14.0?] and/or SDK version
• Are you using Docker or Kubernetes or building Temporal from source?

Additional context