feat(payload, ui): add admin.allowEdit relationship field (#8398)

This PR adds a new property `allowEdit` to the admin of the relationship
field. It is very similar to the existing `allowCreate`, only in this
case it hides the edit icon:

<img width="796" alt="image"
src="https://github.com/user-attachments/assets/bbe79bb2-db06-4ec4-b023-2f1c53330fcb">

test/fields/payload-types.ts

@@ -1140,6 +1140,8 @@ export interface RelationshipField {
     | null;
   relationToSelf?: (string | null) | RelationshipField;
   relationToSelfSelectOnly?: (string | null) | RelationshipField;
+  relationWithAllowCreateToFalse?: (string | null) | User;
+  relationWithAllowEditToFalse?: (string | null) | User;
   relationWithDynamicDefault?: (string | null) | User;
   relationHasManyWithDynamicDefault?: {
     relationTo: 'users';