Data Connect event listener ignored on emulator

### Related issues

### [REQUIRED] Version info

**node:**
20

**firebase-functions:**
7.0.0

**firebase-tools:**

14.26.0

**firebase-admin:**

13.6.0

### [REQUIRED] Test case

Follow this guide:
https://firebase.google.com/docs/functions/data-connect-events

Create a listener:

````
import { onMutationExecuted } from 'firebase-functions/dataconnect';
import { logger } from 'firebase-functions/v2';

export const someListener = onMutationExecuted(
{
region: 'europe-west1',
},
(event) => {
console.log(event.data);
logger.error(event.data);
}
);
````

Trigger any mutation using firebase data connect in the firebase console.

It should work when deployed - but doesn't work on emulator.

### [REQUIRED] Steps to reproduce

Follow this guide:
https://firebase.google.com/docs/functions/data-connect-events

### [REQUIRED] Expected behavior

I expected the event listener to be triggered on mutation on emulator, but it only works on deployment.
In fact, locally the emulator logs does not even list the listener here:

"functions Loaded functions definitions from source: ..."

### [REQUIRED] Actual behavior

Nothing happens - the trigger isn't registered on emulator and therefore no logs are printed.

### Were you able to successfully deploy your functions?

Yes, there it works fine.