e2e tests for integration files format

**User Story:**
As a team, we need to have e2e tests for integration files and their format so we can catch any regression.

**Acceptance Criteria:**
- [ ] review existing e2e tests for integration files (if they exist and they are validating the files themselves)
- [ ] as a priority, try to ensure at least one e2e is associated with the integrations files
- [ ] increase coverage threshold to the most recent value
- [ ] create e2e tests for request and response format on the following (please go in this order):
- [ ] sin check
- [ ] cra check
- [ ] msfaa request (PT and FT)
- [ ] msfaa response (PT and FT)
- [ ] ecert (PT and FT)
- [ ] feedback (PT and FT)
- [ ] federal restrictions
- [ ] disbursement receipt file
- [ ] monthly loan balance
- [ ] sims to sfas bridge
- [ ] sfas to sims bridge

**Additional Context**
Plan to timebox and do as many as we can during time allotted and create subsequent ticket for any remaining e2e tests.