fix: ensure MySQL Users task works for MySQL 8.4

[Diegiwg]

This PR updates the Ensure MySQL users are present task in tasks/users.yml to handle changes introduced in MySQL 8.4, where the mysql_native_password plugin is no longer enabled by default. The update ensures compatibility by using caching_sha2_password for MySQL 8.0 and later.

Changes:

• Added a step to determine the MySQL version before managing users.
• Applied conditional logic to configure MySQL users differently for MySQL 5.7 and MySQL 8.0+.
• Updated the authentication plugin to caching_sha2_password for MySQL 8.0+, preventing Plugin 'mysql_native_password' is not loaded errors.
• Preserved the existing configuration for MySQL 5.7 to maintain backward compatibility.