Add name of the trigger job in title of downstream

What does this MR do?

Instead of using the generic name "child-pipeline"on the card of a child pipeline, we use the trigger job name. This is to facilitate differentiating between child pipelines.

Screenshots (strongly suggested)

This has to support the old and new graph view. To enable the new graph

rails c
Feature.enable(:graphql_pipeline_details)

Old graph view

Before	After

New graph view

Before	After

Does this MR meet the acceptance criteria?

Conformity

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• This change is backwards compatible across updates, or this does not apply.

Availability and Testing

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Security

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