[MySQL]: Enable SSL on mysql server started via docker in integration testing pipeline

We enforce `SSLMode=VerifyFull` in hosted scenarios. However, we are not testing with encrypted connections while connecting with the mysql server started in a docker container in our integration testing pipeline. This issue is to enable SSL in the test environment for MySQL client-server communications.

Few articles I found useful:
https://techsparx.com/software-development/docker/damp/mysql-ssl-connection.html
https://dev.mysql.com/doc/refman/5.7/en/mysql-ssl-rsa-setup.html

Similar change done for MsSQL: #1134