fix(retail): add region tag for node.js - Update import user events from gcs

[rebeccaellis]

Description

Fixes #415382524

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
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• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
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• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

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[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• retail/interactive-tutorials/events/import-user-events-gcs.js:14, tag retail_import_user_events_from_gcs

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[gemini-code-assist]

Summary of Changes

Hello @rebeccaellis, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds region tags to the import-user-events-gcs.js file. These tags are used to identify specific sections of code for documentation and other purposes.

Highlights

• Region Tag: Added region tags retail_import_user_events_from_gcs to the import-user-events-gcs.js file.

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[gemini-code-assist]

Code Review

This pull request adds region tags to the import-user-events-gcs.js sample file. The tags themselves are correctly formatted and placed. However, I've identified a high-severity issue in the existing argument-handling logic within the file. The script does not gracefully handle cases where a bucket name is not provided, which can lead to a runtime error. I've left a comment with a recommendation to improve the script's robustness.