Public form pattern: Sample app accessibility testing

[Spark450]

Acceptance Criteria:

• Deploy a version of the web components version of the "sample app"
• Run Lighthouse on each page of the pattern to identify and fix accessibility issues
• Navigate end-to-end experience using only keyboard control to identify and fix issues
• Use NVDA and JAWS screen readers to ensure the app is navigable and usable for users with vision related disabilities.
• Document any relevant architectural decisions around expected behaviours.
• Record all accessibility testing results (e.g. Lighthouse scores, verified with JAWS & NVDA)
• Update Public Form documentation with relevant product level accessibility testing setup notes.