fix(retail): add region tag for Java - Update purge user events

[rebeccaellis]

Description

Fixes #415382524

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Checklist

• I have followed Sample Format Guide
• pom.xml parent set to latest shared-configuration
• Appropriate changes to README are included in PR
• 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)
• Tests pass: mvn clean verify required
• Lint passes: mvn -P lint checkstyle:check required
• Static Analysis: mvn -P lint clean compile pmd:cpd-check spotbugs:check advisory only
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners 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

[snippet-bot]

Here is the summary of changes.

You are about to add 1 region tag.

• retail/interactive-tutorials/src/main/java/events/PurgeUserEvent.java:23, tag retail_purge_user_events

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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 aims to improve the discoverability and reusability of a Java sample related to purging user events within the retail domain. It achieves this by strategically placing region tags around the relevant code block, which facilitates automated extraction for documentation purposes.

Highlights

• Documentation & Sample Code Organization: Added [START] and [END] region tags to the PurgeUserEvent.java sample file.
• Code Discoverability: These region tags, specifically retail_purge_user_events, enable automated extraction of this code snippet for use in documentation, improving its discoverability and reusability.

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[gemini-code-assist]

Code Review

This pull request adds [START] and [END] region tags to the PurgeUserEvent.java sample. The changes are correct in purpose. My review includes two minor suggestions to improve code style by removing superfluous blank lines around the newly added region tags for better visual consistency and adherence to a cleaner style.

[gemini-code-assist]

For consistency with the recommendation for the [START] tag, the blank line before the [END] tag could also be removed. The tag marks the end of the preceding code block and doesn't need to be separated by a blank line to be clear.

Suggested change

	// [END retail_purge_user_events]
	// [END retail_purge_user_events]