fix(@ngtools/webpack): NGCC workspace libraries module resolution

Fixes angular#14594

Author: alan-agius4

src/ngcc_processor.ts

@@ -97,10 +97,15 @@ export class NgccProcessor {
    */
   private tryResolvePackage(moduleName: string, resolvedFileName: string): string | undefined {
     try {
+      let packageJsonPath = path.resolve(resolvedFileName, '../package.json');
+      if (existsSync(packageJsonPath)) {
+        return packageJsonPath;
+      }
+
       // This is based on the logic in the NGCC compiler
       // tslint:disable-next-line:max-line-length
       // See: https://github.com/angular/angular/blob/b93c1dffa17e4e6900b3ab1b9e554b6da92be0de/packages/compiler-cli/src/ngcc/src/packages/dependency_host.ts#L85-L121
-      const packageJsonPath = require.resolve(`${moduleName}/package.json`,
+      packageJsonPath = require.resolve(`${moduleName}/package.json`,
         {
           paths: [resolvedFileName],
         },