build: turn off dts bundling for packages that still are not supported (#29128)

PR Close #29128

packages/compiler/testing/BUILD.bazel

@@ -10,6 +10,8 @@ ng_module(
         ["**/*.ts"],
         exclude = ["testing.ts"],
     ),
+    # compiler package is built using ts_library which doesn't support bundling yet.
+    bundle_dts = False,
     deps = [
         "//packages:types",
         "//packages/compiler",