chore(gae): rename and delete region tags in standard/modules

[eapl-gemugami]

Description

Fixes Internal: b/399122339

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Please merge this PR for me once it is approved

[snippet-bot]

Here is the summary of changes.

You are about to add 2 region tags.

• appengine/standard/modules/main.py:22, tag gae_standard_modules_import
• appengine/standard/modules/main.py:38, tag gae_standard_modules_access_another_module

You are about to delete 3 region tags.

• appengine/standard/modules/main.py:22, tag modules_import
• appengine/standard/modules/main.py:31, tag module_info
• appengine/standard/modules/main.py:40, tag access_another_module

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