feature(appengine): Update quickstart samples to Nodejs24

[srinjoyray]

Description

Nodejs 24 is going to GA for GAE Standard, Flex, GCF, Cloud Run and CRF.

Checklist

• [x ] 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

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Summary of Changes

Hello @srinjoyray, 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 prepares several quickstart samples for the upcoming General Availability (GA) of Node.js 24 across various Google Cloud services. The changes primarily involve updating runtime and engine configurations to Node.js 24 and Ubuntu 24, ensuring the samples are compatible with the latest environments. Additionally, a .gcloudignore file is introduced to optimize deployments by preventing unnecessary files from being uploaded.

Highlights

• Node.js Runtime Update: The App Engine Standard runtime for the 'building-an-app' sample has been updated from Node.js 20 to Node.js 24.
• Node.js Engine Version: The required Node.js engine version in the 'building-an-app' sample's package.json has been updated from 20.x.x to 24.x.x.
• Operating System Update: The operating system for the App Engine Flexible 'hello-world' sample has been updated from Ubuntu 22 to Ubuntu 24.
• .gcloudignore Addition: A new .gcloudignore file has been added to the 'building-an-app' sample to exclude common development files like node_modules/, .git/, and .gitignore from deployments.

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[gemini-code-assist]

Code Review

This pull request updates the Node.js runtime to version 24 for the appengine/building-an-app/build and appengine/hello-world/flexible quickstart samples. The changes are correct and align with the goal of migrating to Node.js 24. I have one minor suggestion to add a final newline to the new .gcloudignore file. Additionally, I noticed that other quickstart samples like appengine/building-an-app/update and appengine/hello-world/standard are still configured for Node.js 20. To maintain consistency, you might consider updating these samples as well in this or a subsequent pull request.

[iennae]

the only failure is due to genai samples issues unrelated to this change