Only show the session launch failure page when workbench doesn't init #5580
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We currently show the "R failed to launch" error screen whenever R barfs (and it wasn't a quit). This is overly aggressive since R may very well have started up fine but then barfed while running.
To distinguish these cases, this change keeps track of whether the workbench was initialized since the most recent session launch. Once the workbench has initialized, we no longer treat an R crash/failure as a launch failure.