fix: poll integration redirect setup state

[officialasishkumar]

Summary

• Closes Integration setup: redirect prompt step should poll integration setup state #4666
• Poll describe integration while setup is on a redirect prompt step.
• Apply polled setup state to the existing setup controller so completed redirects advance without a manual refresh.
• Add coverage for redirect prompt polling through completion navigation.

Validation

• npm exec prettier -- --write src/hooks/useIntegrations.ts src/pages/organization/settings/components/IntegrationSetup/useIntegrationSetupController.ts src/pages/organization/settings/components/IntegrationSetup/PreCreateIntegrationSetup.spec.tsx
• git diff --check origin/main..HEAD

[superplanehq-integration]

👋 Commands for maintainers:

• /sp start - Start an ephemeral machine (takes ~30s)
• /sp stop - Stop a running machine (auto-executed on pr close)