Exclude node_modules from CodeQL (microsoft#187773)

Exclude node_modules

Author: rzhao271

CodeQL.yml

@@ -21,3 +21,9 @@ path_classifiers:
     - "out-build"
     - "out-vscode"
     - "**/out/**"
+
+  # The default behavior is to tag library code as `library`. Results are hidden
+  # for library code. You can tag further files as being library code by adding them
+  # to the `library` section.
+  library:
+    - "**/node_modules/**"