Incorrect labels and branch names are displayed in the "Filter merge request" fields

### Jenkins and plugins versions report

Jenkins: 2.319.3
OS: Linux - 5.3.0-40-generic
gitlab-plugin:1.5.28

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

Ubuntu 18

### Reproduction steps

1. Step1 - in the job's code add connection to Jenkins Shared Libraries.
2. Step2 - the code should be located on a Gitlab repository.
3. Step 3 - create some branches and labels on this repository.
4. Step 4 - build the job.
5. Step 5 - open the configuration. Click on "Build triggers" - Advanced. On the "Allowed branches" click "Filter branches by name". Try get the branch names - have a look that the branch names are coming from Jenkins Shared Libraries and not from the Gitlab repository with the code.
6. Step 6 - the same is if you select "Filter merge request by label" - the labels are brought from the Jenkins Shared libraries.

### Expected Results

The labels and the branches should be displayed from the Gitlab project with the code and not from the Jenkins Shared libraires.

### Actual Results

The labels and the branches are displayed from the Jenkins Shared libraries and not from the Gitlab repository with the code.

### Anything else?

_No response_