Create Playwright script for the required form Apply workflow using local data

[Bhavna-Ramachandran]

Summary

• Purpose: Build an E2E script for the required form behavior only
• Data: Use local test data to confirm required form validation and submission

Acceptance criteria

• A new Playwright spec file is created (here: /workspaces/simpler-grants-gov/frontend/tests/e2e/apply) and committed.
• The script covers the required-form Apply workflow only.
• The script is written to be reusable and extensible, so it can later be merged with the conditional-form workflow.