fix(cfn-include): AWS::CloudFormation resources fail in monocdk (#12758)

When we did the changes to fix cloudformation-include in #11595,
we did not account for the fact that the `@aws-cdk/core` is not mapped to `uberpackage/core`,
but instead just to the `uberpackage` root namespace.

Special-case the `@aws-cdk/core` module in ubergen when transforming the `cfn-types-2-classes.json` file.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/aws-cdk/test/integ/uberpackage/cfn-include-app/example-template.json

@@ -1,5 +1,8 @@
 {
   "Resources": {
+    "NoopHandle": {
+      "Type": "AWS::CloudFormation::WaitConditionHandle"
+    },
     "Bucket": {
       "Type": "AWS::S3::Bucket",
       "Properties": {

tools/ubergen/bin/ubergen.ts

@@ -333,8 +333,11 @@ async function copyOrTransformFiles(from: string, to: string, libraries: readonl
       const cfnTypes2Classes: { [key: string]: string } = await fs.readJson(source);
       for (const cfnType of Object.keys(cfnTypes2Classes)) {
         const fqn = cfnTypes2Classes[cfnType];
-        // replace @aws-cdk/aws-<service> with <uber-package-name>/aws-<service>
-        cfnTypes2Classes[cfnType] = fqn.replace('@aws-cdk', uberPackageJson.name);
+        // replace @aws-cdk/aws-<service> with <uber-package-name>/aws-<service>,
+        // except for @aws-cdk/core, which maps just to the name of the uberpackage
+        cfnTypes2Classes[cfnType] = fqn.startsWith('@aws-cdk/core.')
+          ? fqn.replace('@aws-cdk/core', uberPackageJson.name)
+          : fqn.replace('@aws-cdk', uberPackageJson.name);
       }
       await fs.writeJson(destination, cfnTypes2Classes, { spaces: 2 });
     } else {