Feat: Add samples for get execution input and output artifacts

[SinaChavoshi]

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Fixes #<issue_number_goes_here> 🦕

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• samples/model-builder/experiment_tracking/get_execution_input_artifacts_sample.py:18, tag aiplatform_sdk_get_execution_input_artifacts_sample
• samples/model-builder/experiment_tracking/get_execution_output_artifacts_sample.py:18, tag aiplatform_sdk_get_execution_output_artifacts_sample

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[nicain]

LGTM