Prevent gems from calling exit or abort during gem load
#2387
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Motivation
We have some internal gems that are meant to be used only during development. They have started enforcing that with a check at gem load time, and by calling
exitto abort the process. This breaks Tapioca gem loading unnecessarily.Implementation
We've already had the mechanism for running a block with disabled exits, so I just moved that to top level, and started using it around gem loading as well.
Tests
Added a test for the new expected behaviour.