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

[sufyanAbbasi]

Mirrors google/ground-android#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:

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