ITVR - Automation: Restrict CRA exchange to only 1 file at a time

**Description:**

To avoid any conflict with the file or data being sent / received form the CRA we want to restrict it so that only 1 file is being exchanged with the CRA at any one time.

**Acceptance Criteria:**

Given I am a government user,
When the CRA data exchange is automated,
Then, to avoid any conflicts in the file exchange with CRA, then I want the system to only ever have one file with CRA at any one time.

**Development Checklist:**
- [ ] 1. Restrict to only one file with CRA during the automation of CRA data exchange.
- [ ] 2. Make the required changes on the automation script to restrict the file exchange to only one.

**Notes:**

# Dependencies

## Blocked By

- [ ] bcgov/itvr/issues/566