test: fix lint errors

src/online-mediation/onlineMediation.service.spec.ts

src/personal-offers/personal-offers.controller.spec.ts

src/structures/services/structures.service.spec.ts

src/users/controllers/employer.controller.spec.ts

src/users/services/employer-search.service.spec.ts

src/users/services/employer.service.spec.ts

src/users/services/jobs.service.spec.ts

src/users/services/users.service.spec.ts

test/app.e2e-spec.ts