chore(gae): migrate and delete region tags or samples in standard/memcache

[eapl-gemugami]

Description

Fixes Internal:
b/398858054
b/347350312
b/347350356
b/347350793
b/347349983
b/347350324

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• Please merge this PR for me once it is approved

[snippet-bot]

You are about to delete the following frozen region tags.

• appengine/standard/memcache/snippets/snippets.py:16, tag add_values(usage: page 1).
• appengine/standard/memcache/snippets/snippets.py:42, tag add_values(usage: page 1).

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Here is the summary of changes.

You are about to add 2 region tags.

• appengine/standard/memcache/snippets/snippets.py:19, tag gae_standard_memcache_get_data
• appengine/standard/memcache/snippets/snippets.py:34, tag gae_standard_memcache_add_values

You are about to delete 11 region tags.

• appengine/standard/memcache/best_practices/batch/batch.py:25, tag batch
• appengine/standard/memcache/best_practices/failure/failure.py:32, tag memcache-read
• appengine/standard/memcache/best_practices/failure/failure.py:48, tag memcache-delete
• appengine/standard/memcache/best_practices/failure/failure.py:60, tag memcache-failure
• appengine/standard/memcache/best_practices/migration_step1/migration1.py:24, tag best-practice-1
• appengine/standard/memcache/best_practices/migration_step2/migration2.py:24, tag best-practice-2
• appengine/standard/memcache/best_practices/sharing/sharing.py:24, tag sharing
• appengine/standard/memcache/snippets/snippets.py:15, tag get_data
• appengine/standard/memcache/snippets/snippets.py:16, tag add_values
• appengine/standard/memcache/snippets/snippets.py:27, tag get_data
• appengine/standard/memcache/snippets/snippets.py:42, tag add_values

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