Refactor FacilityConfig and Facility fetching out of core into the plugins that need it

[rtibbles]

The getFacilities and getFacilityConfig actions (defined here: https://github.com/learningequality/kolibri/blob/develop/kolibri/core/assets/src/state/modules/core/actions.js#L212) are used in the coach, device, facility, and user_auth plugins.

The state is defined here: https://github.com/learningequality/kolibri/blob/develop/kolibri/core/assets/src/state/modules/core/index.js#L16

The two mutations are defined here: https://github.com/learningequality/kolibri/blob/develop/kolibri/core/assets/src/state/modules/core/mutations.js#L2

And two getters are defined here: https://github.com/learningequality/kolibri/blob/develop/kolibri/core/assets/src/state/modules/core/getters.js#L4

• Create a useFacilities composable in kolibri-common that has module level state, to allow for easy replacement of the current actions, state, and getters where they are used.
• Replace all references to the actions, state, getters, and mutations, to use the composable instead.
• Create a useFacilities composable mock for testing purposes.
• Update all frontend tests should to use the mock for the new useFacilities composable.
• Once all references to these two actions and their associated state have been migrated (e.g. https://github.com/search?q=repo%3Alearningequality%2Fkolibri%20getFacilities&type=code) - the actions, state, and mutations should be deleted.