fix(angular): should find the tsconfig at root of project #14379 (#14514)

Author: Coly010

packages/angular/src/builders/webpack-dev-server/webpack-dev-server.impl.ts

@@ -14,15 +14,13 @@ import type { Schema } from './schema';
 import { createTmpTsConfigForBuildableLibs } from '../utilities/buildable-libs';
 import { from } from 'rxjs';
 import { switchMap } from 'rxjs/operators';
+import { getRootTsConfigPath } from 'nx/src/utils/typescript';
 
 export function executeWebpackDevServerBuilder(
   rawOptions: Schema,
   context: import('@angular-devkit/architect').BuilderContext
 ) {
-  process.env.NX_TSCONFIG_PATH = joinPathFragments(
-    context.workspaceRoot,
-    'tsconfig.base.json'
-  );
+  process.env.NX_TSCONFIG_PATH = getRootTsConfigPath();
 
   const options = normalizeOptions(rawOptions);