Make 'path', 'submit_button_text' and 'notice_text' dynamic based on
the factory.
Also adjusted the user. Budget investments require a level 2 user but do not need to be
an administrator.
Copied and renamed the 'documentable_fill_new_valid_budget_investment' method from
common actions, and introduced a 'fill_in_required_fields' method to manage multiple factories.
Added the two tests that were conditionally skipped in the shared example using
'unless: documentable_factory_name == "dashboard_action"', but omitted the call to
'documentable_redirected_to_resource_show_or_navigate_to', since it only applies to
proposals.
Note that when we create the documentable seems do not need use the user as author.
b7adf760f6