disable flaky test (elastic#39163)

(cherry picked from commit c8e4f9c)

# Conflicts:
#	x-pack/test/functional/apps/code/history.ts

Author: spalger

Diff for: x-pack/test/functional/apps/code/history.ts

@@ -130,7 +130,8 @@ export default function manageRepositoriesFunctionalTests({
         });
       });
 
-      it('in search page, change language filters can go back and forward', async () => {
+      // FLAKY: https://github.com/elastic/kibana/issues/39163
+      it.skip('in search page, change language filters can go back and forward', async () => {
         log.debug('it select typescript language filter');
         const url = `${PageObjects.common.getHostPort()}/app/code#/search?q=string&p=&langs=typescript`;
         await browser.get(url);