chore: fix packages transform for stability stripping (#17388)

In #17327, we stripped away the stability banner for `Cfn` resources from README's of alpha modules, since these modules don't actually contain L1 resources. 

Problem is that this stripping causes a bunch of `pkglint` violations on the `v2-main` branch, for example:

```console
@aws-cdk/aws-iot-alpha: In package package.json
--
972 | @aws-cdk/aws-iot-alpha: - [package-info/maturity] Missing stability banner for experimental in README.md file (fixable)
973 | @aws-cdk/aws-iot-alpha: Error: Some package.json files had errors
974 | @aws-cdk/aws-iot-alpha:     at main (/codebuild/output/src115445882/src/github.com/aws/aws-cdk/tools/@aws-cdk/pkglint/bin/pkglint.js:30:15)
975 | @aws-cdk/aws-iot-alpha:     at Object.<anonym
```

This PR fixes the transform and makes the necessary changes so that `pkglint` will be happy. 
Note that this was not detected during merge of #17327 into master since on master, these packages are transformed into private packages, and hence are not validated. 

----

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

tools/@aws-cdk/individual-pkg-gen/transform-packages.ts

@@ -6,18 +6,18 @@ const lerna_project = require('@lerna/project');
 // eslint-disable-next-line @typescript-eslint/no-require-imports
 const ver = require('../../../scripts/resolve-version');
 
-const CFN_STABILITY_BANNER = [
+const CFN_STABILITY_BANNER = `${[
   '![cfn-resources: Stable](https://img.shields.io/badge/cfn--resources-stable-success.svg?style=for-the-badge)',
   '',
   '> All classes with the `Cfn` prefix in this module ([CFN Resources]) are always stable and safe to use.',
   '>',
   '> [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib',
-].join('\n');
+].join('\n')}\n\n`;
 
 const FEATURE_CFN_STABILITY_BANNER = `> **CFN Resources:** All classes with the \`Cfn\` prefix in this module ([CFN Resources]) are always
 > stable and safe to use.
 >
-> [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib`;
+> [CFN Resources]: https://docs.aws.amazon.com/cdk/latest/guide/constructs.html#constructs_lib\n\n<!-- -->\n\n`;
 
 const FEATURE_CFN_STABILITY_LINE = /CFN Resources\s+\| !\[Stable]\(https:\/\/img\.shields\.io\/badge\/stable-success\.svg\?style=for-the-badge\)\n/gm;
 
@@ -168,6 +168,16 @@ function transformPackageJson(pkg: any, source: string, destination: string, alp
     }
   }
 
+  // disable the 'cloudformation' directive since alpha modules don't contain L1 resources.
+  const cdkBuild = packageJson['cdk-build'];
+  if (cdkBuild) {
+    delete cdkBuild.cloudformation;
+    packageJson['cdk-build'] = cdkBuild;
+  }
+
+  // disable `cfn2ts` script since alpha modules don't contain L1 resources.
+  delete packageJson.scripts.cfn2ts;
+
   // disable awslint (some rules are hard-coded to @aws-cdk/core)
   packageJson.awslint = {
     exclude: ['*:*'],