Add git merge request variables to parameter of jenkins build (not only to environment)

### What feature do you want to see added?

We integrated merge request in gitlab with jenkins. All variables gitlab* moving to build to the list of environment, but not to the parameters. That mean that when we have a list of pending requests in jenkins we can't understand which of them connected to which merge request. We had such solution when we worked with github. Variables were added to environment list and to parameters and we was able to read them before build started to run.....

### Upstream changes

_No response_

### Are you interested in contributing this feature?

_No response_