Format informative errors for workflow schema validation

[no-reply]

This is a hack at formatting errors for workflow schema issues.

The new errors are formatted like:

Error on workflow entry [:workflows, 0, :label]
      label must be filled
      Got:
Error on workflow entry [:workflows, 0, :description]
      description must be filled
      Got:
Input was:
      {:workflows=>[{:name=>"ulra_submission", :label=>"", :description=>"",
      :actions=>[{:name=>"approve", :from_states=>[{:names=>["under_review"],
      :roles=>["ulra_reviewing"]}], :transition_to=>"reviewed"}]}]}

Fixes #267.

Guidance for testing, such as acceptance criteria or new user interface behaviors:

• In a test application, update a workflow schema configuration to an invalid format. Observe the new and improved error messages.

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