refactor(@angular-devkit/build-webpack): port 0 WEBPACK_DEV_SERVER_BASE_PORT workaround

No longer needed due to change in webpack-dev-server. See: https://github.com/webpack/webpack-dev-server/blob/ed67f66fc41eb1dd83fb84ecaa18703559dbe2ae/lib/Server.js#L77-L79

Author: alan-agius4

packages/angular_devkit/build_webpack/src/webpack-dev-server/index.ts

@@ -58,13 +58,6 @@ export function runWebpackDevServer(
     return new WebpackDevServer(config, webpack);
   };
 
-  // Force `WEBPACK_DEV_SERVER_BASE_PORT` to use port 0 as base port.
-  // This is needed to handle better concurrent dev-servers. Otherwise if two or more processes starts at the same time
-  // they will end up being assigned the same port due to a race condition between the time you get the port number and
-  // you actually start using it.
-  // https://github.com/webpack/webpack-dev-server/blob/2b1208dadfbe70246a36b74954e3f2fd2c3ba220/lib/Server.js#L76-L94
-  process.env.WEBPACK_DEV_SERVER_BASE_PORT = '0';
-
   const log: WebpackLoggingCallback =
     options.logging || ((stats, config) => context.logger.info(stats.toString(config.stats)));