fix(mysql): independently set ssl_ca, ssl_cert, and ssl_key

[damienwebdev]

Description

This PR allows developers to indepdently set ssl_ca, ssl_cert and ssl_key.

Not all SSL connections require a key, cert and CA file. For instance, Azure Database for MySQL enables SSL connections with only a CA file. See: https://docs.microsoft.com/en-us/azure/mysql/howto-configure-ssl This commit allows developers to port M1 databases out of Azure Database for MySQL to another environment without compromising security.

Fixed Issues (if relevant)

N/A

Manual testing scenarios

1. Try to create a connection to an Azure Database for MySQL by setting ssl_ca in the database config.
2. Run bin/magento migrate:settings
3. Fail with SQLSTATE[HY000] [9002] SSL connection is required. Please specify SSL options and retry.

Contribution checklist

• [x] Pull request has a meaningful description of its purpose
• [x] All commits are accompanied by meaningful commit messages
• [x] All new or changed code is covered with unit/integration tests (if applicable)

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