Fix race condition within HandleWorkflowError
#1795
Draft
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This was noticed while Gonçalo and I were investigating #1796
Also adds a more sensible caption to the error dialog when non-workflow errors occur.
I considered adding a message to the error encouraging people to report the error since we don't expect bare non-workflow exceptions to escape to this point, but the part of my brain responsible for wording things is already running on fumes as I get all these issues out of my head before the weekend 😅