refactor(builtin): npm_umd_bundle no longer allows directory sources

e2e/BUILD.bazel

@@ -127,21 +127,6 @@ e2e_integration_test(
     },
 )
 
-e2e_integration_test(
-    name = "e2e_concatjs_devserver_directory_artifacts",
-    bazel_commands = [
-        "info",
-        # enable runfiles explicitly so it is on for Windows since directory
-        # artifacts requires runfiles
-        "test ... --enable_runfiles",
-    ],
-    npm_packages = {
-        "//packages/concatjs:npm_package": "@bazel/concatjs",
-        "//packages/protractor:npm_package": "@bazel/protractor",
-        "//packages/typescript:npm_package": "@bazel/typescript",
-    },
-)
-
 [e2e_integration_test(
     name = "e2e_typescript_%s" % tsc_version.replace(".", "_"),
     npm_packages = {