Add os preference tracking (#20740)

* Set cookie on os switch

* Set os based on cookie value

* Add os preference schema details

* Send os preference on page request

* Send os preference on os switch

components/lib/events.ts

@@ -100,6 +100,7 @@ export function sendEvent({ type, version = '1.0.0', ...props }: SendEventProps)
       // Preference information
       application_preference: Cookies.get('toolPreferred'),
       color_mode_preference: getColorModePreference(),
+      os_preference: Cookies.get('osPreferred'),
     },
 
     ...props,