API(js) - add a .noErrorModal variant to the request methods
API(js) - add a .noErrorModal variant to the request methods

this way, doing `API.get(url)` always triggers the error modal on error,
but now this can be skipped by using `API.get.noErrorModal(url)` instead.

The same goes for all the other methods.

ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic,ManageIQ/manageiq-ui-classic