### What?
Previously, using Postgres, select fields with `hasMany: true` weren't
clearable.
Meaning, you couldn't pass an empty array:
```ts
const updatedDoc = await payload.update({
id,
collection: 'select-fields',
data: {
selectHasMany: [],
},
})
```
### Why?
To achieve the same behavior with MongoDB.
### How?
Modifies logic in `packages/drizzle/src/upsertRow/index.ts` to include
empty arrays.
e5cc9153aa