Remove user-friendly (formatted) error messages

[maksym-iv-ef]

Mermin is capable of producing user-friendly error messages like:

example error

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Error
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

internal error: failed to open host network namespace: Permission denied (os error 13) - requires hostPID: true in pod spec

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

For more information, run with: --log-level debug
Documentation: https://github.com/elastiflow/mermin

Whilst those are helpful whilst being read from the CLI, it may be a bit trickier when using centralized logging (especially without multiline handling configured)

Following the existing single-line format should be more helpful for the user