Issue367 samples templates

[tswast]

• closes #xxxx
• tests added / passed
• passes nox -s blacken lint

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• samples/snippets/read_gbq_legacy.py:11, tag bigquery_pandas_gbq_read_gbq_legacy
• samples/snippets/read_gbq_simple.py:11, tag bigquery_pandas_gbq_read_gbq_simple
• samples/snippets/to_gbq_simple.py:11, tag bigquery_pandas_gbq_to_gbq_simple

You are about to delete 3 region tags.

• samples/read_gbq_legacy.py:13, tag bigquery_pandas_gbq_read_gbq_legacy
• samples/read_gbq_simple.py:11, tag bigquery_pandas_gbq_read_gbq_simple
• samples/to_gbq_simple.py:11, tag bigquery_pandas_gbq_to_gbq_simple

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[tswast]

Redundant with #380