Reduce the maven logs significantly

What does this MR do?

Currently the maven command is only called with -DskipTests.
This produces a massive amount of logs, because maven logs the downloads process of every dependency.
This MR adds --batch-mode to the default MAVEN_CLI_OPTIONS.
This reduces the generated logs quiet a bit.

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added
• Documentation created/updated for GitLab EE, if necessary
• Documentation created/updated for this project, if necessary
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Job definition updated, if necessary
  • Auto-DevOps template (also in CE)
  • Job definition example
  • CI Templates (to be removed)
  • Vendored CI Templates (also in CE)
• Conforms to the code review guidelines
• Conforms to the Go guidelines
• Security reports checked/validated by reviewer