Handle relations for filters (#13654)

- Refacto variable dropdown so it can display both objects and fields
- we do not filter on object name anymore to simplify the code
- add relation handler in filters



https://github.com/user-attachments/assets/e4f03f11-45cb-4d3f-b628-e996129dd996

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

@@ -222,7 +222,8 @@ export const FormSingleRecordPicker = ({
             instanceId={variablesDropdownId}
             disabled={disabled}
             onVariableSelect={handleVariableTagInsert}
-            objectNameSingularToSelect={objectNameSingular}
+            shouldDisplayRecordObjects={true}
+            shouldDisplayRecordFields={false}
           />
         )}
       </FormFieldInputRowContainer>

packages/twenty-front/src/modules/object-record/record-field/form-types/types/VariablePickerComponent.ts

@@ -3,5 +3,6 @@ export type VariablePickerComponent = React.FC<{
   disabled?: boolean;
   multiline?: boolean;
   onVariableSelect: (variableName: string) => void;
-  objectNameSingularToSelect?: string;
+  shouldDisplayRecordObjects?: boolean;
+  shouldDisplayRecordFields?: boolean;
 }>;