Add option to skip emitting parquet contents to text file

[klei22]

This pull request introduces a new feature to the get_parquet_dataset.py utility, allowing users to download and convert parquet files to JSON without emitting the results to a text file. This is achieved by adding a --skip_emit command-line option and updating the processing logic to honor this flag.

New feature: selective emission of JSON contents

• Added a --skip_emit argument to the CLI, which lets users skip emitting JSON contents to the output text file, enabling download and conversion only.
• Updated the signature of the main function and its invocation to accept the new skip_emit parameter. [1] [2]
• Modified logic so that if skip_emit is set, the output text file is not cleared and JSON contents are not emitted during processing. [1] [2]

[Copilot]

Pull Request Overview

This PR adds a new --skip_emit command-line option to the get_parquet_dataset.py utility, allowing users to download and convert parquet files to JSON without writing the JSON contents to a text output file.

• Added --skip_emit CLI argument with appropriate help text
• Modified the main function signature to accept the new skip_emit parameter
• Updated processing logic to conditionally skip file clearing and JSON emission when the flag is set

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