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

[Bhavna-Ramachandran]

Summary

• Purpose: Build an E2E script that covers the conditional form behavior
• Data: Use local test data for initial development to avoid dependency on Staging setup

Acceptance criteria

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