multipleErrors reports suspicious error concatenation.
errors.Join, multierror.Append and multierr.Append are supported.
Example:
errs = errors.Join(err) // ⚠️ Call with single error doesn't make sense
errs = errors.Join(e, err) // ⚠️ Original one goes away. Typically, it should be like following
errs = errors.Join(errs, err)