feat: Add AutoML vision, Custom training job, and generic prediction samples

[andrewferlitsch]

MBSDK samples + tests

[snippet-bot]

Here is the summary of changes.

You are about to add 7 region tags.

• samples/model-builder/automl_image_classification_training_job_sample.py:19, tag aiplatform_sdk_automl_image_classification_training_job_sample
• samples/model-builder/custom_training_job_sample.py:19, tag aiplatform_sdk_custom_training_job_sample
• samples/model-builder/endpoint_predict_sample.py:19, tag aiplatform_sdk_endpoint_predict_sample
• samples/model-builder/image_dataset_create_classification_sample.py:19, tag aiplatform_sdk_image_dataset_create_classification_sample
• samples/model-builder/image_dataset_create_object_detection_sample.py:19, tag aiplatform_sdk_image_dataset_create_object_detection_sample
• samples/model-builder/image_dataset_create_sample.py:19, tag aiplatform_sdk_image_dataset_create_sample
• samples/model-builder/image_dataset_import_data_sample.py:19, tag aiplatform_sdk_image_dataset_import_data_sample

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[vinnysenthil]

@googlebot I consent.

[sasha-gitg]

Added a few comments. Also, I notice some samples use asynchronous work flow while others don't. Is that intended?