chore(gae): migrate region tags step 1 & 3 - mail/app.yaml

[eapl-gemugami]

Description

Fixes Internal: b/388587061

Documentation won't be updated as it refers to frozen samples: https://cloud.google.com/appengine/docs/standard/services/mail/receiving-mail-with-mail-api

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved

[code-review-assist]

Hi team,

I'm currently reviewing this pull request and will provide my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly understand the changes:

This pull request, chore(gae): migrate region tags step 1 - add new region tags to mail/app.yaml, aims to add new region tags to the app.yaml file within the appengine/standard/mail directory. This is part of a larger migration effort (tracked in b/388587061).

Specifically, the changes include:

• Adding new region tags around existing comment blocks in appengine/standard/mail/app.yaml.
  • Lines 19-25 were modified to add # [START gae_mail_service_yaml_python] and # [END gae_mail_service_yaml_python].
  • Lines 34-40 were modified to add # [START gae_handle_incoming_email_yaml_python] and # [END gae_handle_incoming_email_yaml_python].
  • Lines 41-43 were modified to add # [START gae_handle_all_email_yaml_python] and # [END gae_handle_all_email_yaml_python].
  • Lines 54-60 were modified to add # [START gae_handle_bounced_email_yaml_python] and # [END gae_handle_bounced_email_yaml_python].

The author has indicated that all lint checks passed and followed the sample guidelines.

I'll provide a more detailed review soon.

---

A little poem for your coding pleasure:

Tags in YAML files,
Region markers, neatly placed,
Code now runs clear.

[code-review-assist]

This pull request adds new region tags to the app.yaml file for the App Engine mail samples. The changes look good and follow the expected format for region tags. Since this is step 1 of a larger migration, it's understandable that this PR only focuses on adding the new tags.

It's good practice to break down large migrations into smaller, manageable steps like this.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• appengine/standard/mail/app.yaml:19, tag gae_mail_service_yaml_python
• appengine/standard/mail/app.yaml:32, tag gae_handle_incoming_email_yaml_python
• appengine/standard/mail/app.yaml:37, tag gae_handle_all_email_yaml_python
• appengine/standard/mail/app.yaml:48, tag gae_handle_bounced_email_yaml_python

You are about to delete 4 region tags.

• appengine/standard/mail/app.yaml:19, tag mail_service
• appengine/standard/mail/app.yaml:32, tag handle_incoming_email
• appengine/standard/mail/app.yaml:37, tag handle_all_email
• appengine/standard/mail/app.yaml:48, tag handle_bounced_email

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