fix: deletedAt in TypeWithID not accepting null from generated types (#13363)

### What?

Updated `TypeWithID` so `deletedAt` can accept `null`.

### Why?

Generated collection types for trash use:

```
deletedAt?: string | null
```

`TypeWithID` previously only allowed `string | undefined`, so assigning
documents with `deletedAt: null` caused TypeScript errors.

Aligning the types fixes this mismatch and ensures `TypeWithID` is
compatible with the generated types.

### How?

Modified the `TypeWithID` definition to:

```
export type TypeWithID = {
  deletedAt?: string | null
  docId?: any
  id: number | string
}
```

This makes `deletedAt` effectively `string | null | undefined`, matching
generated types and eliminating type errors.

Fixes #13341

Author: PatrikKozak

packages/payload/src/collections/config/types.ts

@@ -688,15 +688,15 @@ export type AuthCollection = {
 }
 
 export type TypeWithID = {
-  deletedAt?: string
+  deletedAt?: null | string
   docId?: any
   id: number | string
 }
 
 export type TypeWithTimestamps = {
   [key: string]: unknown
   createdAt: string
-  deletedAt?: string
+  deletedAt?: null | string
   id: number | string
   updatedAt: string
 }