feat(samples): add argparse and clarify traversal support in download_many snippet

[chandra-siri]

This PR adds argparse support to the download_many snippet for CLI testing, and updates the description containing traversal safety.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the storage_transfer_manager_download_many.py sample by introducing command-line argument parsing, which simplifies testing and direct execution. It also improves the clarity and safety documentation around file path handling, ensuring users are aware of how directory traversal is managed during downloads.

Highlights

• CLI Support: Added argparse integration to the download_many_blobs_with_transfer_manager snippet, enabling command-line execution and testing with specified bucket, blobs, destination directory, and worker count.
• Traversal Safety Clarification: Updated comments in the download_many_blobs_with_transfer_manager function to explicitly state that the destination_directory parameter now prevents directory traversal outside the specified path, skipping downloads that attempt to do so.
• Warning Handling: Modified the result processing loop to explicitly handle Warning types, printing a message when a download is skipped due to a warning.

Changelog

• samples/snippets/storage_transfer_manager_download_many.py
  • Updated comments to clarify directory traversal behavior and the use of pathlib for path construction.
  • Added argparse setup to allow the script to be run directly from the command line with configurable parameters.
  • Modified the download result processing to include handling for Warning instances, alongside Exception and successful downloads.

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[gemini-code-assist]

Code Review

This pull request introduces argparse support for the download_many snippet, making it easier to use from the command line. It also updates comments to clarify the handling of directory traversal, improving security awareness. Additionally, the result handling is improved to account for warnings, such as when a download is skipped. My review includes a suggestion to fix an issue in a print statement to ensure the displayed download path is correct.