Add Kotlin support

What does this MR do?

This MR adds support for Kotlin projects.

TODOs:

• Add Kotlin files in the global SAST template https://gitlab.com/gitlab-org/gitlab/blob/master/lib/gitlab/ci/templates/Security/SAST.gitlab-ci.yml#L348-350
• Test the changes with a Kotlin project

What are the relevant issue numbers?

Closes gitlab-org/gitlab#36783 (closed)
Closes gitlab-org/gitlab#323648 (closed)

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