fix: add supersededByNhsNumber and clean up mock data

[chrimesdev]

Description

Adds supersededByNhsNumber to the UI mock data following the changes to the API, to allow for testing. Also clean up some of the data that we don't use in the UI in the mock API response (FileName/ErrorRecord)

Context

Type of changes

• Refactoring (non-breaking change)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would change existing functionality)
• Bug fix (non-breaking change which fixes an issue)

Checklist

• I am familiar with the contributing guidelines
• I have followed the code style of the project
• I have added tests to cover my changes
• I have updated the documentation accordingly
• This PR is a result of pair or mob programming

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• I confirm that neither PII/PID nor sensitive data are included in this PR and the codebase changes.

[github-actions]

Unit Test Results

✔️ Tests 744 / 744 - passed in 12.3s
📝 Coverage 56.03%
📏 4083 / 7186 lines covered 🌿 973 / 1838 branches covered
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✏️ updated for commit 2572c59

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
31.1% Duplication on New Code

See analysis details on SonarQube Cloud