Fix bugs in Simulator error handling and end of simulation

[mkorbel1]

Description & Motivation

There were cases where an error could occur during simulation and the simulation would not indicate that it had ended. This PR fixes those bugs and adds tests to cover those scenarios.

For example:

• A registered action throws
• Something calls Simulator.throwException
• An end of simulation action throws

Related Issue(s)

N/A

Testing

Added new tests

Backwards-compatibility

Is this a breaking change that will not be backwards-compatible? If yes, how so?

No

Documentation

Does the change require any updates to documentation? If so, where? Are they included?

No