### 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
try:
        ensure_can_use_sudo()
    except Exception as e:
        LOG.error("cannot start service on privileged port %s: %s", port, str(e))
        return
    
    env_vars = env_vars or {}
    env_vars["PYTHONPATH"] = f".:{LOCALSTACK_ROOT_FOLDER}"
    env_vars["EDGE_FORWARD_URL"] = config.get_edge_url()
    env_vars["EDGE_BIND_HOST"] = config.EDGE_BIND_HOST
    env_vars_str = env_vars_to_string(env_vars)
    
    sudo_cmd = "sudo -n"
    python_cmd = sys.executable
    cmd = [
        sudo_cmd,
        env_vars_str,
        python_cmd,
        "-m",
        "localstack.services.edge",
        component,
        str(port),
    ]
    shell_cmd = " ".join(cmd)
    def run_command(*_):