fix(@schematics/angular): remove explicit outputPath option value from generated applications

The `outputPath` option now defaults to `dist/<project_name>` for applications.
This removes the need to explicitly set the option within a newly generated
project. The value removal also reduces the overall size of the `angular.json`
configuration for new projects. Existing projects are not modified by this
change.

Author: clydin

packages/schematics/angular/application/index.ts

@@ -236,7 +236,6 @@ function addAppToWorkspaceFile(
         builder: Builders.BuildApplication,
         defaultConfiguration: 'production',
         options: {
-          outputPath: `dist/${folderName}`,
           index: `${sourceRoot}/index.html`,
           browser: `${sourceRoot}/main.ts`,
           polyfills: options.experimentalZoneless ? [] : ['zone.js'],

packages/schematics/angular/ssr/index.ts

@@ -81,12 +81,9 @@ async function getApplicationBuilderOutputPaths(
     throw new SchematicsException(`Cannot find 'options' for ${projectName} ${target} target.`);
   }
 
-  const { outputPath } = architectTarget.options;
-  if (outputPath === null || outputPath === undefined) {
-    throw new SchematicsException(
-      `outputPath for ${projectName} ${target} target is undefined or null.`,
-    );
-  }
+  let { outputPath } = architectTarget.options;
+  // Use default if not explicitly specified
+  outputPath ??= posix.join('dist', projectName);
 
   const defaultDirs = {
     server: DEFAULT_SERVER_DIR,