(SP: ) Adjust names for finished quizzes

Adjust the url path names for finished quizzes to match the issue
https://github.com/ita-social-projects/SpaceToStudy-BackEnd/issues/1229
based on PR:
https://github.com/ita-social-projects/SpaceToStudy-BackEnd/pull/1364

- [ ] adjust urls
- [ ] adjust other methods and variables