[FEATURE] Apply SOLID and Clean Code practices

[KalebeLopes]

Is your feature request related to a problem? Please describe.

Suggestion of improvements to try to clean up the code as much as possible by removing variables and functions declared but not used and unnecessary comments.

Describe the solution you'd like

remove from the code variables and functions declared but not used and unnecessary comments.

Describe alternatives you've considered

app/javascript/legacy_react/api/api/NonprofitsApi.ts
app/javascript/legacy_react/api/api/UsersApi.ts

Branch

clean-code-solid