unload from remote (elastic#145641)

## Summary

It appears that the before method sets esNode to either esArchiver or
remoteEsArchiver, but in the after method it uses esArchiver. This
causes the unload to fail on the CCS case.

x-pack/test/functional/apps/lens/group1/index.ts

@@ -63,7 +63,7 @@ export default ({ getService, loadTestFile, getPageObjects }: FtrProviderContext
     });
 
     after(async () => {
-      await esArchiver.unload(esArchive);
+      await esNode.unload(esArchive);
       await PageObjects.timePicker.resetDefaultAbsoluteRangeViaUiSettings();
       await kibanaServer.importExport.unload(fixtureDirs.lensBasic);
       await kibanaServer.importExport.unload(fixtureDirs.lensDefault);