chore(gae): Remove older region tag

[hivanalejandro]

Description

Fixes b/401218453

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Please merge this PR for me once it is approved

[gemini-code-assist]

Hello @hivanalejandro, 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!

Summary of Changes

This pull request removes an older region tag ([START app_yaml] and [END app_yaml]) from the app.yaml file. The goal is to address issue b/401218453. The change simplifies the file by removing the now-unnecessary region tag, leaving only the [START gae_app_yaml] and [END gae_app_yaml] tags.

Highlights

• Region Tag Removal: The pull request removes the older [START app_yaml] and [END app_yaml] region tags from the app.yaml file.
• Issue Fix: This change addresses and resolves issue b/401218453.

Changelog

• appengine/building-an-app/update/app.yaml
  • Removed the [START app_yaml] region tag from line 15.
  • Removed the [END app_yaml] region tag from line 17.

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[gemini-code-assist]

Code Review

The pull request removes an older region tag in the app.yaml file. The change seems straightforward and aims to clean up the configuration file. However, it's important to ensure that the removal of this tag doesn't affect the functionality or documentation of the application.

Merge Readiness

The pull request appears to be a simple cleanup task. Since there are no critical or high severity issues, the pull request seems to be in good shape to be merged. However, I am unable to directly approve the pull request, and other reviewers should review and approve this code before merging.

[eapl-gemugami]

1. The fixed region tag requires a language suffix for node

See polls.yaml#L25 as an example, and the internal resource naming-a-new-region-tag

2. Also I'd recommend adding more context, as app is too broad.
   Perhaps gae_update_app_yaml_node

[eapl-gemugami]

3. You seem to have a conflict with region tag gae_app_yaml. See my review in PR chore(gae): Remove older region tag #4018.