Automatically handle seeing a port 3306 in a connection string

port 3306 can never work for us, and it's common that a DATABASE_URL that you've used in another environemnt that was a traditional mysql driver looks something like: mysql://user:pass@aws.connect.psdb.cloud:3306/dbname

We already ignore the mysql:// protocol and rewrite it to https://, so we should similarly drop the 3306 if a connection is overly explicit.