Task getting cancelled when awaited by AsyncFrostingTask

### Prerequisites

- [X] I have written a descriptive issue title
- [X] I have searched [issues](https://github.com/cake-build/cake/issues) to ensure it has not already been reported

### Cake runner

Cake Frosting

### Cake version

1.1.0

### Operating system

Windows

### Operating system architecture

64-Bit

### CI Server

_No response_

### What are you seeing?

My setup is as follows
AsyncFrostingTask.RunAsync awaits
CustomCode.BuildAsync

CustomCode.BuildAsync is a method that returns a Task from a private CustomMethodAsync that also returns a Task, which comes from Process.WaitAsync.

So the async portion is Process.WaitAsync, which should be returned back to AsyncFrostingTask.RunAsync which awaits it.

However, when I do this, I immediately get a "TaskCanceledException" and the Task doesn't run properly.

I put a try/catch around the CustomCode.BuildAsync call, but it doesn't catch anything.

However, when I go into BuildAsync and CustomMethodAsync and make them async methods that await Process.WaitAsync themselves, everything works as expected and the exception doesn't happen.

### What is expected?

AsynFrostingTask should run Tasks without arbitrarily canceling them.

### Steps to Reproduce

I haven't tried a min repo, but the problem immediately happened when I switched from calling async Task code to calling code that returned a Task without awaiting it, and went away when I switched back.

### Output log

_No response_

Start at AsyncFrostingTask.RunAsync and trace how it awaits the Task returned by CustomCode.BuildAsync, then follow the call through CustomMethodAsync to Process.WaitAsync. First create a minimal reproduction of the reported TaskCanceledException, comparing direct Task returns with methods that await internally. Done means the task completes without arbitrary cancellation and the behavior is covered by a regression test.

Written by the indexing model from the issue text.