fix: resolve CI failures from integrations onboarding step

- Fix TypeScript error: InitIntegrations returning null by transitioning
  to done phase instead
- Fix TypeScript error: Object.fromEntries cast in integration grids by
  typing the array elements
- Update E2E onboarding tests to process the new integrations step
  (skip for now) and increase finish assertion timeout for async mutation

e2e/shared/assertions/onboarding-assertions.ts

@@ -57,6 +57,6 @@ export class OnboardingAssertions {
   }
 
   public async assertFinishStepVisibleAsync() {
-    await this.page.waitForSelector("text=completed the setup", { timeout: 5000 });
+    await this.page.waitForSelector("text=completed the setup", { timeout: 15000 });
   }
 }