Fix testing of Jenkins integration

What does this MR do?

Fix the testing of Jenkins integration that was broken due to we weren't creating the Service/ServiceHook records.

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Users were unable to test their Jenkins integration

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests
  • Added for this feature/bug
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

Closes #3194 (closed)