build: enable bundle_dts for forms package (#28854)

This PR also changes the name of NgNoValidate` to `ɵNgNoValidate`. This is because `ngcc` requires the node to retain the original name while dts bundler will rename the node is it's only exported using the aliases.

Example typings files:
```ts
declare class NgNoValidate{
}
export {NgNoValidateas ɵNgNoValidate}
```

will be emitted as
```ts
export declare class ɵNgNoValidate {
}
```

PR Close #28854

packages/forms/BUILD.bazel

@@ -10,6 +10,7 @@ ng_module(
             "src/**/*.ts",
         ],
     ),
+    bundle_dts = True,
     deps = [
         "//packages/core",
         "//packages/platform-browser",