Changing the Error Log Location (Challenge)

# Introduction

In this challenge, we will be modifying the default error log location of MySQL to a custom location. By completing the tasks, you will create a `mysql` directory under `~/project`, change the user and user group of the error log file, and modify the default error log location in the configuration file. After completing the tasks, you can verify the changes by checking the value of the `log_error` variable in MySQL.