Send valid project path as name for Jira dev panel integration

Further explained on https://gitlab.com/gitlab-org/gitlab-ee/issues/3520

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• Conform by the [merge request performance guides](https://docs.gitlab.com/ee/development/merge_request_performance_guidelines.html)
• Conform by the style guides
• Squashed related commits together