[DEV-11299] Set the current CD to 00 for single congressional district states

[aguest-kc]

Description: Set the current CD to 00 for single congressional district states in the transaction_current_cd_lookup table.

Technical details:

Requirements for PR merge:

1. [ ] Unit & integration tests updated
2. [x] Necessary PR reviewers:
   • [x] Backend
3. [ ] Data validation completed
4. [ ] Appropriate Operations ticket(s) created
5. [x] Jira Ticket DEV-11299:
   • [x] Link to this Pull-Request

Area for explaining above N/A when needed:

2. API documentation updated
No API documentation is affected by this change.

4. Matview impact assessment completed
No matviews are affected by this change.

5. Frontend impact assessment completed
The frontend is not affected by this change.