feat: add web testing foundation with infra-backed suites (#349)

* feat: add web test framework with infra-backed suites

* fix: honor DATABASE_URL env in integration prepare script

* fix: apply web test review feedback

* fix: streamline web test infra lifecycle and workflow scope

apps/web/.env.test.example

@@ -0,0 +1,14 @@
+NODE_ENV=test
+NEXTAUTH_URL=http://localhost:3000
+NEXTAUTH_SECRET=test-secret
+
+DATABASE_URL=postgresql://usesend:password@127.0.0.1:54329/usesend_test
+REDIS_URL=redis://127.0.0.1:6380/15
+
+AWS_ACCESS_KEY=test-access-key
+AWS_SECRET_KEY=test-secret-key
+AWS_DEFAULT_REGION=us-east-1
+
+NEXT_PUBLIC_IS_CLOUD=true
+API_RATE_LIMIT=2
+AUTH_EMAIL_RATE_LIMIT=5