(SP: 3) Replace functionality of CreateCourse in order to use redux slice and store

[Olenka-Hryk]

Rewrite storing date for CreateCourse to use the Redux store instead, as it currently relies on the useForm hook to store this data

Currently, after merging PR: Added event handlers and a Redux store for cooperation #2061 when attempting to create a course and adding attachments, the 'Add' functionality does't append anything after clicking Add button:

Blocked #2099