feat(api): convert last few routes to use token instead of old models

[ollibowers]

tldr

• no more routes require user data in body
• no more 1000000 user representations, shrunk down to 2-3
  • Storage: the current in-use database representation (to be soon removed since we have the new database models)
  • User: the algorithm representation
• no more circular dependencies

major

• converted last routes away from user payloads
  • /courses/getAllUnlocked
  • /courses/unselectCourse/{course}
  • /courses/coursesUnlockedWhenTaken/{course}
  • /ctf/validateCtf (indirectly)
  • /planner/autoplanning
• converted frontend api requests and queries accordingly
• updated all tests accordingly
  • added new example users to support this (derived from 'exampleUser.json')
• created new functions to support this culling
  • created user_storage_to_algo_user(Storage) -> User as the fundamental bridge between the main two user representations
  • derived get_all_course_states_for_user(User) -> CourseStates from /courses/getAllUnlocked body
  • created parse_mark_to_int(Mark) -> Optional[int]
  • created user_storage_to_raw_plan(Storage) -> RawUserPlan to attach UOC and Marks to user planner (for easier term validation)
• removed some no-longer used models and bad functions
  • removed fix_user_data (previously used to add UOC to old planner dicts)
  • removed convert_to_planner_data and ValidPlannerData (previously used for validate_terms)
  • removed UserData (previously used by payload routes)
  • removed ValidCourseState and ValidCoursesState
  • removed PlannerData (previously used by autoplanning)
  • removed prepareUserPayload frontend helper
• convert validate_terms function to use new RawUserPlan type
  • this is a shape that is derived from combing user planner and course marks
• removed markMap from backend, and unified all letter grade conversions

minor

• add new type annotation for User::load_json
• removed env file reliance in 'oidc/constants.py'
• changed no-unused-vars and import order eslint rules to be warning, so compilation is still possible
• changed eslint script to treat warnings as a fail

[martanman]

lgtm