### Is there an existing issue for this?

- [X] I have searched the existing issues

### Current Behavior

We are using the `Authorization` header for routing purposes

```
 "authorization: AWS4-HMAC-SHA256 <...>"
```

https://github.com/localstack/localstack/issues/5770

### Expected Behavior

Use a custom header to avoid causing confusion with backend integrations

### How are you starting LocalStack?

With a `docker run` command

### Steps To Reproduce

Run a custom HTTP integration without authorisation

### Environment

```markdown
- OS: 
- LocalStack:
```


### Anything else?

No
return config.service_port(service)
PROXY_LISTENER_EDGE = ProxyListenerEdge()
ROUTER: Router[Handler] = Router(
    dispatcher=handler_dispatcher(), converters={"regex": RegexConverter}
)
def is_trace_logging_enabled(headers):