Make component utils folders consistent

[Denijar]

Developer Story As a developer, I want component util functions to be stored in a consistent location

Currently, we have a src/utils/dates folder with util functions just for dates. We also have a utils folder located inside components/playlist - we should pick one of these conventions and refactor the other one. If we choose to keep the src/utils folder then we can remove the playlists folder and just have SpotifyPlaylistWrapper as the top level folder

Acceptance Criteria

• a util convention is chosen and the other is refactored