Ora2

TNL-7577 - Studio ORA Block Selector

ORA Assessment Settings toggle controls in studio now work reliably.

Modified the way files were uploaded so that they retain their filenames rather than using whatever default/key the backend provides

**TL;DR -** Stop the `from waffle_utils import WaffleSwitch` shenanigans.

**What changed?**

- WaffleSwitch is not imported from edx-platform's `waffle_utils` (which is deprecated), but from edx-toggles, which is thus added to the base requirements. Note that CourseWaffleFlag objects remain in edx-platform.
- Unit tests were refactored to take this into account.

Do not use waffle for activation of mobile support due to it prevents us from collecting the static assets while building docker images