fix(gae): add new region tags with "gae_storage_" prefix

[OremGLG]

Description

Migration step 1

Migrate all region tags adding the "gae_storage_" prefix
Fixes b/387483288

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

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

[code-review-assist]

Hi team,

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

This pull request, submitted by OremGLG, aims to add new region tags with the prefix "gae_storage_" as a migration step. This addresses issue b/387483288.

The changes are focused on the docs/appengine/storage/app.go file. Specifically, the PR modifies comments and adds the gae_storage_ prefix to several comment blocks, such as those surrounding import statements, get_default_bucket, write, read, copy, and list_bucket functions. The changes are primarily cosmetic, updating existing comment blocks to include the new prefix.

Here's a breakdown of the changes:

• Added gae_storage_ prefix to comments: The gae_storage_ prefix has been added to numerous comment blocks throughout the app.go file. This is consistent across various functions, including file creation, reading, copying, and listing buckets.

• No functional changes: The core functionality of the application remains unchanged. This PR focuses solely on updating comments.

I'll provide a more detailed review soon, but this summary should give you a good overview of the changes.

---

And now, a little haiku to lighten the mood:

Prefix added now,
Code comments clearer, bright, bold,
Review flows smoothly.

[code-review-assist]

This pull request adds new region tags with the "gae_storage_" prefix to the App Engine storage sample. This is a good practice for organizing and managing code snippets within documentation. The changes are well-structured and easy to understand. The added prefixes clearly distinguish the App Engine specific snippets from the general Cloud Storage snippets. The checklist is mostly irrelevant for this change and should be simplified.

[code-review-assist]

Consider adding a short comment explaining the purpose of dev_appserver.py --default_gcs_bucket_name GCS_BUCKET_NAME and how it helps when running the application locally.

Suggested change

	//[START gae_storage_get_default_bucket]
	//[START get_default_bucket]
	//[START gae_storage_get_default_bucket]
	//[START get_default_bucket]

[snippet-bot]

Here is the summary of changes.

You are about to add 6 region tags.

• docs/appengine/storage/app.go:18, tag gae_storage_imports
• docs/appengine/storage/app.go:72, tag gae_storage_get_default_bucket
• docs/appengine/storage/app.go:133, tag gae_storage_write
• docs/appengine/storage/app.go:164, tag gae_storage_read
• docs/appengine/storage/app.go:193, tag gae_storage_copy
• docs/appengine/storage/app.go:252, tag gae_storage_list_bucket

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