Connect the swift package manager to gemnasium finder

What does this MR do?

Configure and register a new package manager for Swift to scan Swift projects.

Link the new package manager registration to the Find project flow in Gemnasium.

What are the relevant issue numbers?

Connect the Swift Package Manager to Gemnasium ... (gitlab-org/gitlab#461776 - 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 a 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 the reviewer