Swagger: Rename Spec to Preferences (#78226)

The definition for preferences is globally named `Spec` because that's the type that cue outputs
This adds a swagger annotation to rename the definition in the swagger schema to `Preferences`
This will be easier to use in generated clients

packages/grafana-schema/src/raw/preferences/x/preferences_types.gen.ts

@@ -21,6 +21,10 @@ export interface CookiePreferences {
   performance?: Record<string, unknown>;
 }
 
+/**
+ * Spec defines user, team or org Grafana preferences
+ * swagger:model Preferences
+ */
 export interface Preferences {
   /**
    * Cookie preferences