Bitbucket integration Settings tab renders blank

### Environment

SaaS (https://sentry.io/)

### Steps to Reproduce

The Settings tab on the Bitbucket integration configuration page renders completely blank — no content, no error message, no loading state.

## Steps to Reproduce
1. Go to Settings > Integrations > Bitbucket
2. Click on a configured Bitbucket integration
3. Observe the Settings tab (default/active tab)

Example: https://kismeow.sentry.io/settings/integrations/bitbucket/412646/?tab=settings

### Expected Result

The Settings tab should either display configurable settings fields, or don't display the Settings page at all

### Actual Result

The tab body is completely empty. No error is thrown in the browser console. No failed network requests in the DevTools Network tab.

### Product Area

Settings - Integrations

### Link

_No response_

### DSN

_No response_

### Version

_No response_