fix(ui): unique ids for nested rows on row duplicate to prevent errors with postgres (#8790)

Fixes https://github.com/payloadcms/payload/issues/8784

This works for any deep level, both arrays and blocks.

test/fields/collections/Blocks/e2e.spec.ts

@@ -130,6 +130,24 @@ describe('Block fields', () => {
     expect(await blocks.count()).toEqual(4)
   })
 
+  test('should save when duplicating subblocks', async () => {
+    await page.goto(url.create)
+    const subblocksRow = page.locator('#field-blocks #blocks-row-2')
+    const rowActions = subblocksRow.locator('.collapsible__actions').first()
+    await expect(rowActions).toBeVisible()
+
+    await rowActions.locator('.array-actions__button').click()
+    const duplicateButton = rowActions.locator('.array-actions__action.array-actions__duplicate')
+    await expect(duplicateButton).toBeVisible()
+    await duplicateButton.click()
+
+    const blocks = page.locator('#field-blocks > .blocks-field__rows > div')
+    expect(await blocks.count()).toEqual(4)
+
+    await page.click('#action-save')
+    await expect(page.locator('.payload-toast-container')).toContainText('successfully')
+  })
+
   test('should use i18n block labels', async () => {
     await page.goto(url.create)
     await expect(page.locator('#field-i18nBlocks .blocks-field__header')).toContainText('Block en')