You are getting this output;

The installation process found evidence that MySQL or MariaDB was installed on this server. You must install cPanel & WHM on a clean server.

You delete mysql or mariadb from your server.  You issuing the following command:

  yum -y remove mysql
  yum -y remove mariadb

And clean your server. Try to reinstall cPanel/WHM.

  yum autoremove

Peace out !

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