test(spanner): Add integration test to check that requests with large message sizes that are under the limit succeed

[kinsaurralde]

Description

Checklist

• I have followed Contributing Guidelines from CONTRIBUTING.MD
• Tests pass: go test -v ./.. (see Testing)
• Code formatted: gofmt (see Formatting)
• Vetting pass: go vet (see Formatting)
• 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

[snippet-bot]

Here is the summary of changes.

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• spanner/spanner_snippets/spanner/spanner_insert_large_data.go:17, tag spanner_insert_large_data

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[gemini-code-assist]

Summary of Changes

Hello @kinsaurralde, 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 introduces a new integration test for Google Cloud Spanner to validate the successful handling of transactions involving large message sizes, specifically those that remain within the 100MB mutation limit. The test leverages a newly added sample function that generates and inserts substantial data into a Spanner database, ensuring the system's robustness and correct behavior under such conditions.

Highlights

• New Integration Test: Added TestTxWithLargeMessageSize to verify that Spanner transactions with large message sizes (under the 100MB limit) succeed.
• New Sample Function: Introduced writeLargeData function in a new file, spanner_insert_large_data.go, which demonstrates inserting multiple rows with a 10MB byte slice each, totaling a large data insertion within Spanner's mutation limits.

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[gemini-code-assist]

Code Review

This pull request adds an integration test to verify that Spanner requests with large message sizes under the API limit can be successfully processed. A new sample function, writeLargeData, is introduced for this purpose, along with a corresponding test, TestTxWithLargeMessageSize. The overall approach is sound and adds valuable test coverage. I have a few suggestions for the new spanner_insert_large_data.go file to improve code quality and adhere to Go best practices.

[sakthivelmanii]

@codyoss Can you please check this?