Allow specifying run name for scheduled pipelines via SDK

Currently, the Vertex AI Pipelines service allows specifying a "Scheduled run name" for scheduled pipeline runs via the GUI. However, this functionality is not available when creating schedules using the Python SDK.

When creating scheduled runs from the SDK, the "Scheduled run name" is automatically generated and includes the date in a fixed format. This makes it difficult to identify and manage specific runs, especially when dealing with multiple schedules and frequent executions.

No file or test is named. Start by locating the Python SDK entry point for creating scheduled Vertex AI Pipeline runs and compare its available arguments with the GUI's Scheduled run name behavior. Done means callers can provide a scheduled run name instead of receiving only the automatically generated fixed-date format, with focused schedule-creation coverage where available.

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