Set connection pool and overflow limits when using Node.js

Configure the connection pool size and overflow when connecting to Cloud SQL for MySQL using the Node.js npm mysql module.

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For detailed documentation that includes this code sample, see the following:

To authenticate to Cloud SQL for MySQL, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

// 'connectionLimit' is the maximum number of connections the pool is allowed
// to keep at once.
connectionLimit: 5,

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