feat: Shows an alert in container sync if the only change is a local override to a text component [FC-0097] (#2516)

- Implements the alert described in https://github.com/openedx/frontend-app-authoring/issues/2438#issuecomment-3358670967

src/data/types.ts

@@ -64,6 +64,7 @@ export interface UpstreamInfo {
   isModified?: boolean,
   hasTopLevelParent?: boolean,
   readyToSyncChildren?: UpstreamChildrenInfo[],
+  isReadyToSyncIndividually?: boolean,
 }
 
 export interface XBlock {