feat: A new field response_id is added to message `.google.cloud.ai…

…platform.v1.GenerateContentResponse`

feat: A new field `create_time` is added to message `.google.cloud.aiplatform.v1.GenerateContentResponse`

PiperOrigin-RevId: 725444773

Source-Link: googleapis/googleapis@de1e1c0

Source-Link: googleapis/googleapis-gen@163253b
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