JS: Overlay annotations for some failing tests

Locally these seem to get rid of the compilation warnings, but of course
CI is the true arbiter here.

javascript/ql/test/library-tests/ModuleImportNodes/CustomImport.ql

@@ -1,5 +1,6 @@
 import javascript
 
+overlay[local]
 class CustomImport extends DataFlow::ModuleImportNode::Range, DataFlow::CallNode {
   CustomImport() { this.getCalleeName() = "customImport" }