implement e2e testing with Maestro and Browserstack

[achou11]

Introduces e2e test automation using Maestro, configured to run as part of CI.

Current workflow diagram (will update as needed):

graph LR
  build-android["Build (Android)\n[skip if draft PR]"]
  build-ios["Build (iOS)\n[skip if draft PR]"]
  upload-test-suite["Upload test suite\n[skip if draft PR]"]
  test-android["Run tests (Android)"]
  test-ios["Run tests (iOS)"]

  build-android -->|app_url| test-android
  build-ios -->|app_url| test-ios
  upload-test-suite -->|test_suite_url| test-android
  upload-test-suite -->|test_suite_url| test-ios

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Relevant links:

• CI/CD integration for Browserstack + Maestro: https://www.browserstack.com/docs/app-automate/maestro/ci-cd-integration
• API reference for Browserstack + Maestro: https://www.browserstack.com/docs/app-automate/api-reference/maestro/overview
• Supported devices for App Automate: https://www.browserstack.com/list-of-browsers-and-platforms/app_automate

TODO:

• Add another job to the workflow to listen for and report test results
• Update repo with relevant actions environment variables