Windows: the opentelemetry-instrument wrapper does not preserve parent-child process relationship

[karolz-ms]

Describe your environment

OS: Windows 11
Python version: 3.12.10
Package version: 1.33.0

What happened?

See repro & expected

Steps to Reproduce

1. Programmatically start a Python program via opentelemetry-instrument wrapper.
2. Observe the process hierarchy.

Expected Result

The started program should stay in the process tree, e.g.

launcher program (grandparent)
   |--> opentelemetry-instrument.exe (parent)
              |--> started program (child)

The telemetry wrapper should keep running (forwarding stdin/stdout/stderr and CTRL_C to the started program as necessary).

Actual Result

The started program is not part of the launched program process tree. opentelemetry-instrument.exe process exits immediately after the started program is launched.

Additional context

This behavior breaks development tools like .NET Aspire, which rely on the fact that child processes are part of the same process tree to discover all children and clean them up during shutdown.

Would you like to implement a fix?

None