chore(aiplatform): Change CreateBatchPredictionGeminiJobSample to use gemini 2.5

[amcolin]

Description

Internal b/481401219

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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

[gemini-code-assist]

Summary of Changes

Hello @amcolin, 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This pull request updates a sample application to use a newer version of the Gemini model for batch prediction. This ensures the sample remains current with the latest available models, providing users with an up-to-date example of how to leverage advanced AI capabilities within their applications.

Highlights

• Model Version Update: The CreateBatchPredictionGeminiJobSample has been updated to utilize the gemini-2.5-flash model, replacing the older gemini-2.0-flash-001 version.

Changelog

• aiplatform/src/main/java/aiplatform/batchpredict/CreateBatchPredictionGeminiJobSample.java
  • Updated the model name from 'gemini-2.0-flash-001' to 'gemini-2.5-flash'.

Activity

• No activity has occurred on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates the model name used in the CreateBatchPredictionGeminiJobSample from gemini-2.0-flash-001 to gemini-2.5-flash. This change aligns with the pull request title and appears to be a direct update of the model version. The primary feedback concerns a maintainability improvement for the hardcoded model name.

[gemini-code-assist]

The model name "gemini-2.5-flash" is hardcoded directly within the String.format call. For improved maintainability and to reduce the risk of typos, especially for critical API parameters like model names, it is generally a good practice to define such string literals as private static final String constants at the class level. This makes the value easier to locate and update if it changes in the future. Due to the constraint of only commenting on modified lines and providing compilable code suggestions, a direct code suggestion for adding a constant declaration is not provided here.