Updates linked pipelines to render inline

What does this MR do?

Expands upstream and downstream pipelines within the main graph

What are the relevant issue numbers?

Closes #2122 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [n.a.] 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
• [n.a.] Conforms to the database guides
• [n.a.] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• EE specific content should be in the top level /ee folder
• For a paid feature, have we considered GitLab.com plans, how it works for groups, and is there a design for promoting it to users who aren't on the correct plan?