feat(cloud_sql/sqlserver): update to V2 sample

[jsimonweb]

• Update region tags
• Update DB_HOST env. variable to be INSTANCE_HOST

[snippet-bot]

Here is the summary of possible violations 😱

Details

There is a possible violation for removing region tag in use.

• cloud_sql/sqlserver/pdo/src/app.php:39, tag cloud_sql_sqlserver_pdo_timeout(usage: page 1).

The end of the violation section. All the stuff below is FYI purposes only.

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You are about to delete the following sample browser pages.

• cloud_sql/sqlserver/pdo/src/DBInitializer.php:44, tag cloud_sql_sqlserver_pdo_create_tcp(usage: page 1).
• cloud_sql/sqlserver/pdo/src/app.php:39, tag cloud_sql_sqlserver_pdo_timeout(usage: page 1).

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You are about to delete the following frozen region tag.

• cloud_sql/sqlserver/pdo/src/DBInitializer.php:44, tag cloud_sql_sqlserver_pdo_create_tcp(usage: page 1 page 2 page 3 page 4 page 5 page 6 page 7).

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Here is the summary of changes.

You are about to add 2 region tags.

• cloud_sql/sqlserver/pdo/src/DatabaseTcp.php:20, tag cloud_sql_sqlserver_pdo_connect_tcp
• cloud_sql/sqlserver/pdo/src/DatabaseTcp.php:55, tag cloud_sql_sqlserver_pdo_timeout

You are about to delete 2 region tags.

• cloud_sql/sqlserver/pdo/src/DBInitializer.php:44, tag cloud_sql_sqlserver_pdo_create_tcp
• cloud_sql/sqlserver/pdo/src/app.php:39, tag cloud_sql_sqlserver_pdo_timeout

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[bshaffer]

Rather than do this, we can use the /** @runInSeparrateProcess */ annotation in PHPUnit, which ensures that the environment variables are isolated to the call.

[jsimonweb]

Done.