ci: re-enable components-repo-unit-tests job (#37176)

With 844208f46345e285cf789de431fa87f1bb483375, we disabled the
components-repo-unit-tests job. The components repo landed the required
TS 3.9.x update, so we can re-enable the job again.

PR Close #37176

.circleci/config.yml

@@ -848,12 +848,9 @@ workflows:
             - build-npm-packages
             - build-ivy-npm-packages
             - legacy-unit-tests-saucelabs
-      # The below 'components-repo-unit-tests' is disabled until the Components team support building and testing their
-      # repo with TypeScript 3.9. The TS 3.9 update is being done in https://github.com/angular/components/pull/19336.
-      # We should re-enable this CI job, when the mentioned PR gets merged.
-      # - components-repo-unit-tests:
-      #     requires:
-      #       - build-npm-packages
+      - components-repo-unit-tests:
+          requires:
+            - build-npm-packages
       - test_zonejs:
           requires:
             - setup