Remove deprecated Config.errorMessages field

[manusa]

Is your task related to a problem? Please describe

The field Config.errorMessages is now deprecated (#5166 / #5199) and useless.

Describe the solution you'd like

Remove the field from the Config class.

Describe alternatives you've considered

No response

Additional context

This task con only be completed after v6.8.0 is released.

[aniketh3014]

I want to work on this can I get it assigned to me

[stale]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!

[stale]

This issue has been automatically marked as stale because it has not had any activity since 90 days. It will be closed if no further activity occurs within 7 days. Thank you for your contributions!