fix(db-postgres): ensure deletion of numbers and texts in upsertRow (#11787)

### What?
This PR fixes an issue while using `text` & `number` fields with
`hasMany: true` where the last entry would be unreachable, and thus
undeletable, because the `transformForWrite` function did not track
these rows for deletion. This causes values that should've been deleted
to remain in the edit view form, as well as the db, after a submission.

This PR also properly threads the placeholder value from
`admin.placeholder` to `text` & `number` `hasMany: true` fields.

### Why?
To remove rows from the db when a submission is made where these fields
are empty arrays, and to properly show an appropriate placeholder when
one is set in config.

### How?
Adjusting `transformForWrite` and the `traverseFields` to keep track of
rows for deletion.

Fixes #11781

Before:


[Editing---Post-dbpg-before--Payload.webm](https://github.com/user-attachments/assets/5ba1708a-2672-4b36-ac68-05212f3aa6cb)

After:


[Editing---Post--dbpg-hasmany-after-Payload.webm](https://github.com/user-attachments/assets/1292e998-83ff-49d0-aa86-6199be319937)

test/fields/int.spec.ts

@@ -33,6 +33,7 @@ import {
   checkboxFieldsSlug,
   collapsibleFieldsSlug,
   groupFieldsSlug,
+  numberFieldsSlug,
   relationshipFieldsSlug,
   tabsFieldsSlug,
   textFieldsSlug,
@@ -401,6 +402,31 @@ describe('Fields', () => {
 
       expect(resInSecond.totalDocs).toBe(1)
     })
+
+    it('should delete rows when updating hasMany with empty array', async () => {
+      const { id: createdDocId } = await payload.create({
+        collection: textFieldsSlug,
+        data: {
+          text: 'hasMany deletion test',
+          hasMany: ['one', 'two', 'three'],
+        },
+      })
+
+      await payload.update({
+        collection: textFieldsSlug,
+        id: createdDocId,
+        data: {
+          hasMany: [],
+        },
+      })
+
+      const resultingDoc = await payload.findByID({
+        collection: textFieldsSlug,
+        id: createdDocId,
+      })
+
+      expect(resultingDoc.hasMany).toHaveLength(0)
+    })
   })
 
   describe('relationship', () => {
@@ -1042,6 +1068,30 @@ describe('Fields', () => {
 
       expect(numbersNotExists.docs).toHaveLength(1)
     })
+
+    it('should delete rows when updating hasMany with empty array', async () => {
+      const { id: createdDocId } = await payload.create({
+        collection: numberFieldsSlug,
+        data: {
+          localizedHasMany: [1, 2, 3],
+        },
+      })
+
+      await payload.update({
+        collection: numberFieldsSlug,
+        id: createdDocId,
+        data: {
+          localizedHasMany: [],
+        },
+      })
+
+      const resultingDoc = await payload.findByID({
+        collection: numberFieldsSlug,
+        id: createdDocId,
+      })
+
+      expect(resultingDoc.localizedHasMany).toHaveLength(0)
+    })
   })
 
   it('should query hasMany within an array', async () => {