fix(ui): hide edit button on deleted relationship options (#11005)

### What?
This PR fixes an issue where a deleted relationship entry would lead to
a runtime error if the user clicked on the edit button in ui due to not
having a `doc` available in `handleServerFunction`.

### Why?
To prevent runtime errors during expected usage.

### How?
By hiding the edit button in entries that have been deleted. This is
done for entries where the user does not have read access already.

Fixes #11004

Before:

[Editing---Post-userdelete--before--Payload.webm](https://github.com/user-attachments/assets/33180eba-9be3-418f-92d2-3bad93e3dfae)

After:

[Editing---Post-userdelete--after--Payload.webm](https://github.com/user-attachments/assets/ba1a736b-3422-4fe0-93ae-7e8e6496d1bd)

packages/ui/src/fields/Relationship/optionsReducer.ts

@@ -70,6 +70,7 @@ export const optionsReducer = (state: OptionGroup[], action: Action): OptionGrou
         ) {
           loadedIDs.push({ id, relationTo: relation })
           newSubOptions.push({
+            allowEdit: false,
             label: `${i18n.t('general:untitled')} - ID: ${id}`,
             relationTo: relation,
             value: id,

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

@@ -185,6 +185,35 @@ describe('relationship', () => {
     await expect(locator1).toHaveCount(0)
   })
 
+  test('should hide edit button in main doc when relationship deleted', async () => {
+    const createdRelatedDoc = await payload.create({
+      collection: textFieldsSlug,
+      data: {
+        text: 'doc to be deleted',
+      },
+    })
+    const doc = await payload.create({
+      collection: relationshipFieldsSlug,
+      data: {
+        relationship: {
+          value: createdRelatedDoc.id,
+          relationTo: textFieldsSlug,
+        },
+      },
+    })
+    await payload.delete({
+      collection: textFieldsSlug,
+      id: createdRelatedDoc.id,
+    })
+
+    await page.goto(url.edit(doc.id))
+
+    const editBtn = page.locator(
+      '#field-relationship button.relationship--single-value__drawer-toggler',
+    )
+    await expect(editBtn).toHaveCount(0)
+  })
+
   // TODO: Flaky test in CI - fix this. https://github.com/payloadcms/payload/actions/runs/8910825395/job/24470963991
   test.skip('should clear relationship values', async () => {
     await page.goto(url.create)