Build integration tests for recruiter search endpoint

**Description**
Test that a recruiter can perform both simple and complex queries in live integration tests. This likely involves us creating a few users, setting their attributes, and making sure that the recruiter query returns these users and doesn't return other users. Then, we destroy those users (this functionality is pending https://github.com/acm-uiuc/resume-book/issues/36).

**Acceptance Criteria**
- Recruiter search functionality is thoroughly tested.