bug: application auth-redirect CORS error

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Current Behavior

When making API calls from out application running behind coder application, after a few seconds, all requests get redirected

and then start failing with:

```
Access to fetch at 'https://fr.coder.domain/api/v2/applications/auth-redirect?redirect_uri=https%3A%2F%2Facme-dot-backoffice--0--rvigee.fr.coder.domain%2Fredacted%2Fapi%2Fv3%2Fgraphql' (redirected from 'https://acme-dot-backoffice--main--0--rvigee.fr.coder.domain/redacted/api/v3/graphql') from origin 'https://acme-dot-backoffice--main--0--rvigee.fr.coder.domain' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource.
```

until the page is refreshed.

This is particularly frustrating for our frontend team which has to spend the whole day refreshing the browser...

### Relevant Log Output

```shell

```

### Expected Behavior

Not needing to refresh the browser every 10s

### Steps to Reproduce

1. Create an application
2. Access it
3. wait 30s
4. Have it make requests using fetch
5. See it fail with CORD

### Environment

- Host OS: linux
- Coder version: 2.27.3

### Additional Context

The issue occurs consistently, The issue is new (previously worked fine), The issue happens on multiple deployments, I have tested this on the latest version