Ensure rendered exceptions take up minimal space

[patriksvensson]

Fixes #1844

• I have read the Contribution Guidelines
• I have checked that there isn't already another pull request that solves the above issue
• All newly added code is adequately covered by tests
• All existing tests are still running without errors

Changes

The generated renderable that contains the exception information was set to expand to the maximum terminal area. This pull request changes the behavior to instead use as little space as possible.

Also made exceptions easier to test by adding an ExceptionInfoResolver that gets the
exception information used when rendering an exception. This way, we do not have to
do manual exception scrubbing of the output (that messes up rendering).

---

Please upvote 👍 this pull request if you are interested in it.