Make svsim shutdown gracefully when the test throws an exception (backport #3309)

[mergify]

This is an automatic backport of pull request #3309 done by Mergify.

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Original PR Body

Type of Improvement

• Bugfix

Release Notes

• Fixed an issue where throwing an assert from an svsim simulation run may kill the simulated process before it can finish writing a waveform.

Reviewer Checklist (only modified by reviewer)

• Did you add the appropriate labels? (Select the most appropriate one based on the "Type of Improvement")
• Did you mark the proper milestone (Bug fix: 3.5.x or 3.6.x depending on impact, API modification or big change: 5.0.0)?
• Did you review?
• Did you check whether all relevant Contributor checkboxes have been checked?
• Did you do one of the following when ready to merge:
  • Squash: You/ the contributor Enable auto-merge (squash), clean up the commit message, and label with Please Merge.
  • Merge: Ensure that contributor has cleaned up their commit history, then merge with Create a merge commit.