[Code health] Set up end to end testing (local web, mobile, and database emulation)

[sufyanAbbasi]

Mirrors https://github.com/google/ground-android/issues/2420

Formulating an overall strategy to run end to end testing on the mobile and web app. Will need to configure something like Docker or Github Hosted Runners which will spin up a local web server + Selenium WebDriver, local Android emulator + app, and a set up local Firebase database/emulator then run through a set of core tests.

[gino-m]

Next steps:

• [x] Get full flow (web+Android) working on GitHub Actions to size memory and runtime
• [x] Split into two (web + Android), testing Firestore state in between
• [ ] Add additional test coverage (CUJs and screen rotation)

[sufyanAbbasi]

Update: With the submission of #1820, we now have the ability to run three commands in PR comments:

• /createTest will run through the survey creation flow
• /verifyTest will run through the survey submission verification flow against the data/test-submit local snapshot
• /e2eTest will run the create test, then pass through data to the ground-android's submit test flow, then will pass that data through to the verify test.
  • Unfortunately, there is still a bug with the emulator that we need to fix up

I believe all the rest of the TODOs are Android related, I think this flow is working quite well! Closing out this bug for now, leaving the Android one, https://github.com/google/ground-android/issues/2420, open.