chore(discoveryengine): update gemini to 2.5-flash in answer query sample

[angelcaamal]

Fixes #481443740

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Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• 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 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 @angelcaamal, 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 the discoveryengine sample for answer queries to utilize the latest gemini-2.5-flash model. This ensures the sample code remains current with the available model versions, providing users with improved performance and features for answer generation within the Discovery Engine.

Highlights

• Gemini Model Version Update: The answer_query_sample.py file has been updated to use the gemini-2.5-flash model version for answer generation, replacing the older gemini-2.0-flash-001 version.

Changelog

• discoveryengine/answer_query_sample.py
  • Updated the model_version within the AnswerGenerationSpec.ModelSpec from gemini-2.0-flash-001/answer_gen/v1 to gemini-2.5-flash/answer_gen/v1.

Activity

• The author, angelcaamal, has initiated the pull request to address issue #481443740.
• The author has completed several items on the PR checklist, including following sample guidelines.
• No external review comments or further activity have been recorded yet.

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[gemini-code-assist]

Code Review

This pull request updates the Gemini model version to gemini-2.5-flash in the answer_query_sample. The change is straightforward and correctly implements the intended update. The code is clear and follows existing patterns. I have no further suggestions.