Build eligibility check page for DIY & Virtual Vita flows

[embarnard]

Link to pivotal/JIRA issue

• e.g. https://codeforamerica.atlassian.net/browse/GYR1-904

Is PM acceptance required? (delete one)

• Yes - don't merge until JIRA issue is accepted!
• No - merge after code review approval

Reminder: merge main into this branch and get green tests before merging to main

What was done?

• Adds eligibility page at the beginning of the virtual vita and DIY flows
• follows these designs

How to test?

• Change to session time to be after open intake in heroku
• start flow and route to boy GYR and DIY flow to see eligibility page

Screenshots (for visual changes)

[github-actions]

Heroku app: https://gyr-review-app-6164-9386be61a022.herokuapp.com/
View logs: heroku logs --app gyr-review-app-6164 (optionally add --tail)

[spompea-cfa]

lgtm