feat/DF-717: Shows reference number on confirmation page if enabled

[jbarnsley10]

Proposed change

Shows reference number on confirmation page (if the option is enabled in the Form Definition)
Uses the DEC alphabet (reduced set of letters and numbers to avoid mis-reading confusion)
If it detects profanity in the generated reference number (excluding hyphens), it generates a new reference number

Jira ticket: DF-717

Type of change

• Bug fix
• New feature
• Breaking change
• Misc. (documentation, build updates, etc)

Checklist

• You have executed this code locally and it performs as expected.
• You have added tests to verify your code works.
• You have added code comments and JSDoc, where appropriate.
• There is no commented-out code.
• You have added developer docs in README.md and docs/* (where appropriate, e.g. new features).
• The tests are passing (npm run test).
• The linting checks are passing (npm run lint).
• The code has been formatted (npm run format).

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud