Multi Branch Job Executed in jenkins but Pipeline status is still running state in GitLab

### Jenkins and plugins versions report

Environment

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

GitLab deployed on VM (RHEL)

### Reproduction steps

1. Created GitLab server connection with detected the Projects in GitLab. (Added webhook config)
2. Created a multi branch pipeline using this plugin and discovered the branches.
3. Open a merge request in GitLab project and trigger the Multi Branch Pipeline.
4. Multi Branch Pipeline detected the Open MR and Ran the Job and completed successfully.
5. But in GitLab It is showing Pipeline is still in running state because of which can't merge the MR (unless pipeline status shows as success in Gitlab)

### Expected Results

Pipeline in GitLab should display the status and allow the merge request to merge successfully.

### Actual Results

Pipeline is always in Running State and not displaying the success or failure status.

### Anything else?

_No response_

### Are you interested in contributing a fix?

_No response_