MOBILE-4532 quiz: Update behat tests

[marxjohnson]

MDL-68806 adds the new "Submitted" quiz attempt state, which means that once an attempt is submitted, grades will not be available until the ad-hoc tasks have run.

[NoelDeMartin]

I've found some things to improve, but overall the changes are good to go.

However, the CI won't pass until MDL-68806 is integrated in core, so we can't merge this until then. Once we resolve the changes I suggested, I can approve this and then we'll be able to merge it as soon as the core issue is integrated.

[marxjohnson]

Thanks for the pointers @NoelDeMartin, and for providing that updated snapshot. I have pushed an updated branch with those changes.

[NoelDeMartin]

Thanks @marxjohnson, I think this could be merged now but as I mentioned we need to wait until MDL-68806 is integrated.

[crazyserver]

Hi @marxjohnson, the issue has been integrated, could you please rebase your code?

[dpalou]

@crazyserver the original issue was split in 2, and the one that affects the app is MDL-82654 which hasn't been integrated yet.

[crazyserver]

Oops, sorry my fault!