Gitlab event payload on any Mr is not been exposed

### Jenkins and plugins versions report

Environment

```text
Paste the output here
```

### What Operating System are you using (both controller, and any agents involved in the problem)?

Darwin

### Reproduction steps

* gitlab plugin globally exposed env doesn't have any information regarding event payload?
* I need payload information so can have some custom logic to validate payload information.

### Expected Results

Expose `gitlabLatestPayload`

### Actual Results

No environment being exposed

### Anything else?

_No response_