ci(jest-changed-files): enable mercurial related test on CI (#12327)

e2e/__tests__/jestChangedFiles.test.ts

@@ -466,13 +466,6 @@ testIfHg('gets changed files for hg', async () => {
 });
 
 testIfHg('monitors only root paths for hg', async () => {
-  if (process.env.CI) {
-    // Circle and Travis have very old version of hg (v2, and current
-    // version is v4.2) and its API changed since then and not compatible
-    // any more. Changing the SCM version on CIs is not trivial, so we'll just
-    // skip this test and run it only locally.
-    return;
-  }
   writeFiles(DIR, {
     'file1.txt': 'file1',
     'nested-dir/file2.txt': 'file2',