Add MAVEN_CLI_OPTS analyzer flag

What does this MR do?

Adds new flag MAVEN_CLI_OPTS to gemnasium-maven to enable callers to add maven options when installing project.

What are the relevant issue numbers?

Add support for MAVEN_CLI_OPTS

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
  • [-] Job definition example
  • [-] CI Templates
• [-] Conforms to the code review guidelines
• [-] Conforms to the Go guidelines
• [-] Security reports checked/validated by reviewer