fix: hide add-select-option prompt for users without data model permission (#23410)

Fixes #23341

## Problem

A user whose role lacks the `DATA_MODEL` permission flag still saw the
`Add "…" to options` prompt when typing a value that matched no option
in a multiselect. Clicking it did nothing.

`MultiSelectInput` renders `AddSelectOptionMenuItem` based purely on
whether the callback exists:

```tsx
{onAddSelectOption && searchFilter && filteredOptionsInDropDown.length === 0 && (
```

`MultiSelectFieldInput` always passed a callback, and did the permission
check *inside* it:

```tsx
const handleAddSelectOption = (optionName: string) => {
  if (!canAddSelectOption) {
    return;
  }
  addSelectOption(optionName);
};
```

So the guard suppressed the click but not the render, which is exactly
the reported symptom: the prompt is visible and inert.

## Fix

Gate at the prop instead of inside the handler, so the menu item is
never rendered when the action is unavailable:

```tsx
onAddSelectOption={canAddSelectOption ? addSelectOption : undefined}
```

The wrapper is now redundant and removed; `addSelectOption` already has
the matching `(optionName: string) => void` signature.

`SelectFieldInput` had the byte-identical bug (`SelectInput` gates on
`onAddSelectOption &&` the same way), so it gets the same change.

## Note on scope

`useCanAddSelectOption` requires `objectNamePlural` from the route in
addition to the permission flag:

```ts
const canAddSelectOption =
  userHasPermissionToEditDataModel &&
  isNonEmptyString(fieldName) &&
  isNonEmptyString(objectNamePlural);
```

Record *detail* pages (`/object/:objectNameSingular/:recordId`) have no
`objectNamePlural`, so the prompt was dead there for **every** user,
admins included. This change hides it in that case too, which is the
correct behavior since the click could never have worked.

## Testing

Verified manually against a local instance, toggling the patch in and
out on the same cell so before/after is directly comparable.

Company `Work Policy` (multiselect) in the Companies table view, typing
a string that matches no option:

| user | route | before | after |
|---|---|---|---|
| Member (no `DATA_MODEL`) | `/objects/companies` | prompt shown, click
does nothing | prompt hidden |
| Admin | `/objects/companies` | prompt shown, click works | prompt
shown, click works (navigates to
`/settings/objects/companies/workPolicy?newOption=…`) |
| Admin | `/object/company/:id` | prompt shown, click does nothing |
prompt hidden |

`nx lint:diff-with-main twenty-front` and `nx typecheck twenty-front`
both pass.


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packages/twenty-front/src/modules/object-record/record-field/ui/meta-types/input/components/MultiSelectFieldInput.tsx

@@ -41,13 +41,6 @@ export const MultiSelectFieldInput = () => {
     onSubmit?.({ newValue: draftValue });
   };
 
-  const handleAddSelectOption = (optionName: string) => {
-    if (!canAddSelectOption) {
-      return;
-    }
-    addSelectOption(optionName);
-  };
-
   return (
     <MultiSelectInput
       selectableListComponentInstanceId={
@@ -58,7 +51,7 @@ export const MultiSelectFieldInput = () => {
       onCancel={handleCancel}
       onOptionSelected={handleOptionSelected}
       values={draftValue}
-      onAddSelectOption={handleAddSelectOption}
+      onAddSelectOption={canAddSelectOption ? addSelectOption : undefined}
     />
   );
 };

packages/twenty-front/src/modules/object-record/record-field/ui/meta-types/input/components/SelectFieldInput.tsx

@@ -55,13 +55,6 @@ export const SelectFieldInput = () => {
     onCancel?.();
   };
 
-  const handleAddSelectOption = (optionName: string) => {
-    if (!canAddSelectOption) {
-      return;
-    }
-    addSelectOption(optionName);
-  };
-
   const handleSubmit = (option: SelectOption) => {
     onSubmit?.({ newValue: option.value });
 
@@ -110,7 +103,7 @@ export const SelectFieldInput = () => {
           : undefined
       }
       clearLabel={fieldDefinition.label}
-      onAddSelectOption={handleAddSelectOption}
+      onAddSelectOption={canAddSelectOption ? addSelectOption : undefined}
     />
   );
 };