Add basic matrix section of Jenkinsfile

[Bilgetz]

Add a basic Matrix section for Jenkinsfile like the official documentation.
https://www.jenkins.io/doc/book/pipeline/syntax/#declarative-matrix
This PR do not have all option of it ( like exclude ), but code can be improve latter.

Testing done

I added a test with a Jenkinsfle with matrix who check stage well be called for each value of matrix.

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2. Ensure that the pull request title represents the desired changelog entry
3. Please describe what you did
4. Link to relevant issues in GitHub or Jira
5. Link to relevant pull requests, esp. upstream and downstream changes
6. Ensure you have provided tests - that demonstrates feature works or fixes the issue

I don' see any issue in github or jira for it.