Fixed: Select fields now selects on pressing the enter key (#5576)

Now while pressing the `Enter` button, the select field selects the
relevant option.

- Added a `handleKeyDown` function to set the `persistField` with the
selected option.
- Added an `onKeyDown` event on `DropdownMenuSearchInput` component, to
trigger `handleKeyDown` when `Enter` is pressed.
- Fixes: #5556

---------

Co-authored-by: Lucas Bordeau <bordeau.lucas@gmail.com>

packages/twenty-front/src/modules/object-record/select/types/SelectFieldHotkeyScope.tsx

@@ -0,0 +1,3 @@
+export enum SelectFieldHotkeyScope {
+  SelectField = 'select-field',
+}