Pipeline Graph Structural Update: Add Linked Pipeline Interactions

What does this MR do?

This is the next feature MR in #276949 (closed). It does the following:

• adds the upstream and downstream components to the new graph component
• replaces the LinkedPipelineColumn with new functionality (legacy files added in !48779 (merged))
• adjusts the legacy code where needed to work together
• updates related specs, including mockData

All GraphQL code additions are behind the :graphql_pipeline_details flag, which is off.

Screenshots (strongly suggested)

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downstream
upstream

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines
• Style guides

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Related to #276949 (closed)