Add job to update common in all analyzers

What does this MR do?

• After git tag a commit of common library, the downstream pipeline can be triggered to create MRs (one for each analyzer which is using common). Each of these generated MR contains the changes related to version update of common library.

What are the relevant issue numbers?

• gitlab-org/gitlab#11466 (comment 322828213)

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
• [-] Conforms to the code review guidelines
• [-] Conforms to the Go guidelines
• Security reports checked/validated by reviewer