fix: refactor tests (#1066)

## Changes Made

- Refactor/optimise tests
- Reduce flakiness
- Add parallel tests (if there's enough CPU capacity)
- Removed explicit worker count when running parallel tests. Defaults to
50% of CPU capacity.

Might want to consider sharding the test across runners in the future as
our tests grows.

packages/app-tests/playwright.config.ts

@@ -17,12 +17,11 @@ export default defineConfig({
   testDir: './e2e',
   /* Run tests in files in parallel */
   fullyParallel: true,
+  workers: '50%',
   /* Fail the build on CI if you accidentally left test.only in the source code. */
   forbidOnly: !!process.env.CI,
   /* Retry on CI only */
-  retries: process.env.CI ? 2 : 0,
-  /* Opt out of parallel tests on CI. */
-  workers: process.env.CI ? 1 : undefined,
+  retries: process.env.CI ? 2 : 1,
   /* Reporter to use. See https://playwright.dev/docs/test-reporters */
   reporter: 'html',
   /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */