feat: child DAG runs started with action: dag.run do not update the DAG list

A child dag's run record is stored nested under the parent dag's run record when the parent triggers with action: dag.run. The dag list / workflows view shows the child as "not started" or the last time it was run directly (manually or scheduled).

Request is to update the child dag's run records when it was triggered by a parent with action: dag.run

Trace how child DAG runs triggered by `action: dag.run` are stored under the parent run record and how the DAG list or workflows view reads the latest run. Confirm the child record is reflected in the list when triggered by a parent, without changing direct, manual, or scheduled run behavior.

Written by the indexing model from the issue text.