build(language-service): include sources for Ivy LS (#39748)

We need to expose the declaration files for Ivy sources so that they can
be consumed by the Angular language server (`@angular/language-server`).

PR Close #39748

packages/language-service/BUILD.bazel

@@ -45,6 +45,7 @@ pkg_npm(
     ],
     deps = [
         ":language-service",
+        "//packages/language-service/ivy",
         # min bundle is not used at the moment; omit from package to speed up build
         "//packages/language-service/bundles:language-service.js",
         "//packages/language-service/bundles:ivy.js",