DPC-4114: Fix Sync Organization

[jdettmannnava]

🎫 Ticket

https://jira.cms.gov/browse/DPC-4114

🛠 Changes

DpcClient returns FHIR:Bundle from get_organization_by_npi

ℹ️ Context for reviewers

get_organization_by_npi was trying to unmarshall the wrong object

✅ Acceptance Validation

• Updated tests
• Ran SyncOrganizationJob in dpc-portal rails console, and it interacted with the backend appropritately

🔒 Security Implications

• This PR adds a new software dependency or dependencies.
• This PR modifies or invalidates one or more of our security controls.
• This PR stores or transmits data that was not stored or transmitted before.
• This PR requires additional review of its security implications for other reasons.

If any security implications apply, add Jason Ashbaugh (GitHub username: StewGoin) as a reviewer and do not merge this PR without his approval.

[ashley-weaver]

👍 thanks!