[DESIGN] Test and validate language for SNN input

[kalasgarov]

We need to ensure that the Social Security Number (SSN) input field validates according to a specific set of requirements. This includes clear communication of error and hint messages to the user. Our objectives are to:

• Confirm the language used for validation requirements.
• Determine how error messages and hints will be displayed to users.

Requirements:

• Validation Requirements: Ensure the SSN follows the format and rules specified (e.g., must be exactly 9 digits, cannot start with certain prefixes, etc.).
• Error Messages: Clearly communicate what is wrong with the input when validation fails.

Related links:
https://www.ssa.gov/kc/SSAFactSheet--IssuingSSNs.pdf
https://designsystem.digital.gov/patterns/create-a-user-profile/social-security-number/