Add empty option to select form field (#12898)

## Before

New option selected, but not taken into account

<img width="744" alt="image"
src="https://github.com/user-attachments/assets/880421e2-5582-40f3-809a-ef443517b510"
/>


## After

<img width="750" alt="image"
src="https://github.com/user-attachments/assets/d5114712-a08a-4867-a93c-da5240f81472"
/>

packages/twenty-front/src/modules/object-record/record-field/form-types/components/FormSelectFieldInput.tsx

@@ -15,6 +15,7 @@ import { isDefined } from 'twenty-shared/utils';
 import { SelectOption } from 'twenty-ui/input';
 import { GenericDropdownContentWidth } from '@/ui/layout/dropdown/constants/GenericDropdownContentWidth';
 import { useTheme } from '@emotion/react';
+import { IconCircleOff } from 'twenty-ui/display';
 
 type FormSelectFieldInputProps = {
   label?: string;
@@ -93,6 +94,12 @@ export const FormSelectFieldInput = ({
     (option) => option.value === draftValue.value,
   );
 
+  const emptyOption = {
+    label: `No ${label}`,
+    value: '',
+    Icon: IconCircleOff,
+  };
+
   const handleUnlinkVariable = () => {
     setDraftValue({
       type: 'static',
@@ -132,6 +139,7 @@ export const FormSelectFieldInput = ({
             options={options}
             value={selectedOption?.value}
             onChange={onSelect}
+            emptyOption={emptyOption}
             fullWidth
             hasRightElement={isDefined(VariablePicker) && !readonly}
             withSearchInput