Remove ChakraCore CI job

Installation of ChakraCore by ESVU for some reason has been flaky for
quite a long time. Can't reproduce locally. This CI job doesn't add much
value by itself, so just remove it until some future time.

Closes: #3953

.circleci/config.yml

@@ -95,15 +95,15 @@ jobs:
       hostPath: spidermonkey
       hostName: spidermonkey
     <<: [*execution_steps]
-  "ChakraCore: New or modified tests execution":
-    docker:
-      - image: *node_image
-    working_directory: ~/test262
-    environment:
-      hostType: ch
-      hostPath: chakra
-      hostName: chakra
-    <<: [*execution_steps]
+  # "ChakraCore: New or modified tests execution":
+  #   docker:
+  #     - image: *node_image
+  #   working_directory: ~/test262
+  #   environment:
+  #     hostType: ch
+  #     hostPath: chakra
+  #     hostName: chakra
+  #   <<: [*execution_steps]
   "JSC: New or modified tests execution":
     docker:
       - image: *node_image
@@ -140,7 +140,7 @@ workflows:
       - "Test262: verify tools; build & lint tests"
   Tests execution:
     jobs:
-      - "ChakraCore: New or modified tests execution"
+      # - "ChakraCore: New or modified tests execution"
       - "JSC: New or modified tests execution"
       - "SpiderMonkey: New or modified tests execution"
       - "V8: New or modified tests execution"