only one @updatedAt is filled by the QE although multiple are accepted in the schema

[do4gr]

We should either allow and document only one use of @updatedAt per model or update all of them if the row is touched instead of only the first one.

// Valid datamodel
model TestModel {
      id                    Int       @id
      test                  Int?
      updatedAt_w_default   DateTime  @default(now()) @updatedAt
      updatedAt_wo_default  DateTime? @updatedAt
      createdAt             DateTime  @default(now())
}

field.rs
// code only surfacing first updatedAt per model
 pub fn updated_at(&self) -> &Option<ScalarFieldRef> {
        self.updated_at.get_or_init(|| {
            self.scalar_weak()
                .iter()
                .map(|sf| sf.upgrade().unwrap())
                .find(|sf| sf.is_updated_at)
        })
    }