Fix auto_time_skipping_disabled

[igillis-clara]

Checklist

1. Closes [Bug] auto_time_skipping_disabled not resuming after block exit #259

2. How was this tested:

• Made the change locally and it fixed the test I was writing in my application
• Wrote a test for this PR

Failing Before Fix

Passing After Fix

4. Any docs updates needed?
   An example using this helper would be nice but probably out of scope for this PR

[CLAassistant]

All committers have signed the CLA.

[cretz]

Thanks! I think our logic at https://github.com/temporalio/sdk-dotnet/blob/d48377d698b2a2cb7a8c58d181959df473875314/src/Temporalio/Testing/WorkflowEnvironment.cs#L323-L338 is wrong (and https://github.com/temporalio/sdk-python/blob/e3603989f081bb812d883189be5f5ac9aa127089/temporalio/testing/_workflow.py#L464-L472 is right), so time to fix .NET too heh.

[cretz]

Can you sign the CLA (via link above) so we can merge? Or let me know if already signed and it's not updating.

[igillis-clara]

Signed

[igillis-clara]

I don't know if this line is required -- seemed to run fine on my apple silicon Mac 🤷 but left it for consistency

[cretz]

Thanks! Yeah it runs in macos due to rosetta x64 translator, but technically we don't support time-skipping on ARM (though it was added recently, we just have to update the auto downloader).