fix(@angular-devkit/build-angular): resolve lazy route Angular package from project base

Closes #16219

(cherry picked from commit 316786d)

Author: clydin

packages/ngtools/webpack/src/angular_compiler_plugin.ts

@@ -792,7 +792,9 @@ export class AngularCompilerPlugin {
     if (this._discoverLazyRoutes) {
       // Add lazy modules to the context module for @angular/core
       compiler.hooks.contextModuleFactory.tap('angular-compiler', cmf => {
-        const angularCorePackagePath = require.resolve('@angular/core/package.json');
+        const angularCorePackagePath = require.resolve('@angular/core/package.json', {
+          paths: [this._basePath],
+        });
 
         // APFv6 does not have single FESM anymore. Instead of verifying if we're pointing to
         // FESMs, we resolve the `@angular/core` path and verify that the path for the