Don't test if benefit-cap-calculator is visualisable
Don't test if benefit-cap-calculator is visualisable

A new test was added to check it each flow can be visualised from the
/visualise endpoint. i.e. a valid flow chart can be viewed from this endpoint.

The benefit-cap-calculator has been added to an exclusion list so that it's
visualisation is not tested because:

1. Dynamic questions break the visualisation at the moment
2. The original visualisation was messy and unusable

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