Dont create license_management build when not included in license

What does this MR do?

Don't bother creating the job if we are going to just exit early anyway. This is important in our docker+machine architecture because we spin up a whole new VM per job which is quite costly.

See https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/4907#note_104742212

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated
• [-] Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides