Fix TaskInstance.get_dagrun returning None in task_instance_mutation_hook #60726
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Fixes #60610
TaskInstance.get_dagrun() could return None when the dag_run relationship
was marked as loaded but unset, which occurs in early lifecycle phases such as
task_instance_mutation_hook.
This change ensures the DagRun is fetched from the database in that case,
restoring access to DagRun.conf without altering lifecycle semantics.