fix(@angular/build): consistently set "default" baseHref

Previously, the default value for baseHref (set to `/`) was defined in multiple places, leading to inconsistency. A recent commit inadvertently removed one of these defaults see: https://github.com/angular/angular-cli/pull/28283/files#diff-803b0bd9e1fd57eefba877e946b85b13517170ad5fadb906a11308bc4b3b9fdaL148

This change consolidates the default logic by removing redundant definitions and moving the default baseHref configuration to schema.json for consistency.

Closes angular#28442

packages/angular/build/src/builders/application/execute-post-bundle.ts

@@ -52,7 +52,7 @@ export async function executePostBundleSteps(
   const prerenderedRoutes: string[] = [];
 
   const {
-    baseHref = '/',
+    baseHref,
     serviceWorker,
     indexHtmlOptions,
     optimizationOptions,

packages/angular/build/src/builders/application/options.ts

@@ -305,13 +305,18 @@ export async function normalizeOptions(
 
   // Initial options to keep
   const {
+    /**
+     * Note: These default values should match those in schema.json.
+     * The reason these defaults are defined here is that, in certain internal builders,
+     * they are either not set or the options are provided.
+     */
+    baseHref = '/',
+    inlineStyleLanguage = 'css',
     allowedCommonJsDependencies,
     aot,
-    baseHref,
     crossOrigin,
     externalDependencies,
     extractLicenses,
-    inlineStyleLanguage = 'css',
     outExtension,
     serviceWorker,
     poll,

packages/angular/build/src/builders/application/schema.json

@@ -315,7 +315,8 @@
     },
     "baseHref": {
       "type": "string",
-      "description": "Base url for the application being built."
+      "description": "Specifies the base URL for the application, used to resolve all relative URLs within the app.",
+      "default": "/"
     },
     "verbose": {
       "type": "boolean",
@@ -531,7 +532,7 @@
     }
   },
   "additionalProperties": false,
-  "required": ["outputPath", "index", "browser", "tsConfig"],
+  "required": ["outputPath", "index", "browser", "tsConfig", "inlineStyleLanguage", "baseHref"],
   "definitions": {
     "assetPattern": {
       "oneOf": [