UN-2157 get dossiers rates

[Kariamos]

No description provided.

[github-actions]

Tests difference:

New Tests

< Route GET /dossiers/rates - Should answer 200 if user is admin
< Route GET /dossiers/rates - Should answer 401 if not admin
< Route GET /dossiers/rates - Should answer 403 if not logged in
< Route GET /dossiers/rates - Should return 200 if user has full campaign olps
< Route GET /dossiers/rates - Should return 200 if user has only some campaign olps
< Route GET /dossiers/rates - Should return array of items
< Route GET /dossiers/rates - Should return items with id, name and rate

[coveralls]

coverage: 78.809% (+0.02%) from 78.793%
when pulling d7a92cf on UN-2157-get-dossiers-rates
into 639b2ee on develop.