fix(@angular/build): simplify disabling server features with --no-server via command line

When `outputMode` is configured, `--prerender` and `--app-shell` become no-ops, making server feature disabling difficult without modifying the configuration.

This commit introduces the `--no-server` option, which can be used with `--output-mode static` to fully disable all server features.

```
ng build --output-mode static --no-server
```

(cherry picked from commit d8f926f)

Author: alan-agius4

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

@@ -18,7 +18,18 @@
     },
     "server": {
       "type": "string",
-      "description": "The full path for the server entry point to the application, relative to the current workspace."
+      "description": "The full path for the server entry point to the application, relative to the current workspace.",
+      "oneOf": [
+        {
+          "type": "string",
+          "description": "The full path for the server entry point to the application, relative to the current workspace."
+        },
+        {
+          "const": false,
+          "type": "boolean",
+          "description": "Indicates that a server entry point is not provided."
+        }
+      ]
     },
     "polyfills": {
       "description": "A list of polyfills to include in the build. Can be a full path for a file, relative to the current workspace or module specifier. Example: 'zone.js'.",