chore: Drop io_error_more feature

[abhinav]

The io_error_more feature hasn't been stabilized yet.
It's easy enough to do this without it.

[abhinav]

This change is part of the following stack:

• chore: Drop io_error_more feature #105 ◀
  • chore: Drop exit_status_error feature flag #106

_{Change managed by git-spice.}