feat: Add triggered_by and triggering_user_name to Task SDK DagRun model

[LomotHo]

• Add DagRunTriggeredByType and triggering_user_name fields to Execution API DagRun model
• Regenerate Task SDK models with new fields for user tracking
• Enable DAG tasks to access triggering user information via context['dag_run']

This allows DAG tasks to access information about who triggered the DAG run and how it was triggered, enabling better audit trails and user-specific logic.

related PR:

• Add Triggering User Name to the DagRun UI page #53510
• Add tracking of triggering user to Dag runs #51738

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[boring-cyborg]

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[github-actions]

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