This pull request introduces end-to-end (E2E) testing infrastructure for the frontend using Playwright, including environment setup, configuration, and a sample test. It adds Playwright dependencies, a test environment configuration, scripts for automated infrastructure setup, and updates to the Makefile for safer factory resets. The changes are grouped below by theme.

E2E Testing Infrastructure

• Added Playwright as a dev dependency (@playwright/test, playwright, playwright-core) and configured Playwright for E2E tests in frontend/playwright.config.ts, including web server startup and environment variable management. [1] [2] [3] [4] [5]
• Created a sample Playwright test (frontend/tests/core/onboarding.spec.ts) to verify onboarding content is visible.
• Added a global setup script (frontend/tests/globalSetup.ts) and shell scripts (scripts/setup-e2e.sh, scripts/start-backend-e2e.sh) to automate environment preparation and backend startup for tests. [1] [2] [3]

Environment and Configuration

• Introduced .env.test for test-specific environment variables, and updated .gitignore to allow committing this file and ignore Playwright reports. [1] [2]
• Increased webpack chunk load timeout in frontend/next.config.ts to prevent timeouts during development with large bundles.

Makefile and Miscellaneous

• Improved factory-reset in Makefile to allow forced resets without user confirmation and removed redundant deletion of the opensearch-data directory. [1] [2]
• Added a test id to the onboarding content div for easier test targeting (frontend/app/onboarding/_components/onboarding-content.tsx).