Fixes 2404 allow faster cancel from PI

[rwmcintosh]

Fixes #2404

Description

We were canceling all future runs, but not stopping the current run. The runs can take quite a lot of time.

Conversely, canceling a simulation is very fast...

Type of change

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• Bug fix (non-breaking change which fixes an issue)
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[rwmcintosh]

I guess I still had some fancy code in my local simmodel that made this possible. This PR alone isn't enough because the stock simmodel in v12 does not stop PI simulation runs due to the ShowProgress flag being false