Remove unused code

hypha/apply/api/v1/determination/utils.py

...c/src/app/src/common/components/PageDownWidget/index.scss

hypha/static_src/src/app/src/containers/Determination.js

hypha/static_src/src/app/src/containers/Determination.scss

...c_src/src/app/src/containers/DeterminationForm/actions.js

...tic_src/src/app/src/containers/DeterminationForm/index.js

...c_src/src/app/src/containers/DeterminationForm/reducer.js

..._src/src/app/src/containers/DeterminationForm/styles.scss

hypha/static_src/src/app/src/redux/store.js