chore(pkglint): uncomment pkglint functionality (#28622)

This was unintentionally commented out in a previous PR. Adding it back in.

This also includes the changes that pkglint would have picked up, if not commented out.

----

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

packages/aws-cdk/THIRD_PARTY_LICENSES

@@ -461,7 +461,7 @@ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLI
 
 ----------------
 
-** cdk-from-cfn@0.91.0 - https://www.npmjs.com/package/cdk-from-cfn/v/0.91.0 | MIT OR Apache-2.0
+** cdk-from-cfn@0.113.0 - https://www.npmjs.com/package/cdk-from-cfn/v/0.113.0 | MIT OR Apache-2.0
 
 ----------------
 

packages/aws-cdk/package.json

@@ -155,4 +155,4 @@
   "publishConfig": {
     "tag": "latest"
   }
-}
+}

tools/@aws-cdk/cdk-build-tools/package.json

@@ -86,4 +86,4 @@
   "ubergen": {
     "exclude": true
   }
-}
+}

tools/@aws-cdk/pkglint/bin/pkglint.ts

@@ -1,7 +1,7 @@
 #!/usr/bin/env node
 import * as path from 'path';
 import * as yargs from 'yargs';
-//import { findPackageJsons, ValidationRule } from '../lib';
+import { findPackageJsons, ValidationRule } from '../lib';
 
 const argv = yargs
   .env('PKGLINT_')
@@ -19,7 +19,6 @@ if (typeof(directory) !== 'string') {
 argv.directory = path.resolve(directory, process.cwd());
 
 async function main(): Promise<void> {
-  /*
   const ruleClasses = require('../lib/rules'); // eslint-disable-line @typescript-eslint/no-require-imports
   const rules: ValidationRule[] = Object.keys(ruleClasses).map(key => new ruleClasses[key]()).filter(obj => obj instanceof ValidationRule);
 
@@ -37,7 +36,6 @@ async function main(): Promise<void> {
   if (pkgs.some(p => p.hasReports)) {
     throw new Error('Some package.json files had errors');
   }
-  */
 }
 
 main().catch((e) => {