chore: make tests OS agnostic

[lifeiscontent]

What I did

1. Update Playwright to run tests across MacOS and Linux
2. Update Playwright to run across 4 different shards to speed up test runtime
3. Update Playwright to use ./tests/integration as when using VSCode is provides a nice icon to the integration folder if using an icon pack
4. Fix Playwright report merging
5. Update tests to handle keyboard interactions across various OS types
6. Use corepack in CI to install pnpm
7. Use process.env.NODE_ENV === 'production' to determine if React is running in Strict mode rather than process.env.CI
8. add favicon to playground to stop showing 404 errors in playwright
9. fix typo of isStrictMode

closes #379

[edmundhung]

Thanks for working on this!

Should we run the same test suites on window as well? Also, let's not change any package code in this PR.

[lifeiscontent]

@edmundhung I'm not sure if its worth it, the E2E tests with MacOS + Windows increase by more than double in terms of execution time, if you want to proceed with it anyway, I'll update to run MacOS again I tried to get Windows to run, but it looks like the playground Remix app doesn't run on windows currently 😅

[edmundhung]

Just one minor issue with the folder structure changes. Otherwise looks good to me. Thank you!

[edmundhung]

@edmundhung I'm not sure if its worth it, the E2E tests with MacOS + Windows increase by more than double in terms of execution time, if you want to proceed with it anyway, I'll update to run MacOS again I tried to get Windows to run, but it looks like the playground Remix app doesn't run on windows currently 😅

We can run them in parallel with GitHub action, right? I am fine to merge it as is but it would definitely be a big plus to be able to test on all 3 platforms.

[lifeiscontent]

@edmundhung this is ready for review now, just need to update the required status checks in GitHub's Settings to the new names

[lifeiscontent]

@edmundhung using sharding in Playwright the total test time has slightly increased by a few seconds, so you won't see too much of a longer wait 🎉