fix(retail): add region tag for node.js - Update write_user_event.js

[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)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• 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/write-user-event.js:17, tag retail_write_user_event

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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 enhances the write-user-event.js sample by incorporating standard region tags. This change is crucial for automated documentation processes, allowing the code snippet to be easily extracted and presented in official documentation, thereby improving the discoverability and usability of the sample for developers.

Highlights

• Sample Code Tagging: Added [START] and [END] region tags to the write-user-event.js sample, enabling automated extraction and documentation generation for this specific code block.

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[gemini-code-assist]

Code Review

This pull request adds region tags to the write_user_event.js sample. The changes are straightforward, but I've provided a suggestion to improve the code within the newly created region tags by removing an unnecessary blank line.

[gemini-code-assist]

This added blank line is unnecessary and can be removed to improve code conciseness.