Env variable like GITLAB_OA_IID are not set when a MR job is triggered manually from Jenkins

### Jenkins and plugins versions report

Environment

```text
Jenkins: 2.346.2
OS: Linux - 3.10.0-1160.71.1.el7.x86_64
Java: 1.8.0_342 - Red Hat, Inc. (OpenJDK 64-Bit Server VM)
---
PrioritySorter:4.1.0
ace-editor:1.1
adoptopenjdk:1.5
analysis-model-api:10.17.0
ant:481.v7b_09e538fcca
antisamy-markup-formatter:2.7
apache-httpcomponents-client-4-api:4.5.13-138.v4e7d9a_7b_a_e61
async-http-client:1.9.40.0
atlassian-bitbucket-server-integration:3.3.2
authentication-tokens:1.4
aws-java-sdk:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-cloudformation:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-codebuild:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ec2:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ecr:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ecs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-efs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-elasticbeanstalk:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-iam:1.12.287-357.vf82d85a_6eefd
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aws-java-sdk-minimal:1.12.287-357.vf82d85a_6eefd
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aws-java-sdk-sqs:1.12.287-357.vf82d85a_6eefd
aws-java-sdk-ssm:1.12.287-357.vf82d85a_6eefd
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ws-cleanup:0.43
xray-for-jira-connector:1.3.0
```

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

Linux

### Reproduction steps

Have a project configured:

* *Discover branches:* Only branches that are not also filed as MRs
* *Discover merge requests from origin:* Merging the merge request with the current target branch revision

Open an MR in GitLab.

This triggers a job in the MR view:

On one Job in this MR view click on "Build" (or "Build with parameter" if the Jenkinsfile defines some parameter) to trigger a manual job.

### Expected Results

I would like the env variables (like `GITLAB_OA_IID`, `GITLAB_OA_SOURCE_BRANCH`, `GITLAB_OA_LAST_COMMIT_ID` ...) to be set as it is the case when the Job is triggered from GitLab.

### Actual Results

All the `GITLAB_` env variable are not set in case of a manually triggered job.

### Anything else?

Maybe I should rewrite my Jenkinsfile to use other env variable that are present in both the GitLab triggered and the Manually triggered case:

* `CHANGE_BRANCH` seems to be `GITLAB_OA_SOURCE_BRANCH`
* `CHANGE_ID` seems to be `GITLAB_OA_IID`

But I could not find a equivalent of `GITLAB_OA_LAST_COMMIT_ID`