build: enable importHelpers in tsconfig (#22812)

This is the primary tsconfig file used for Bazel builds.
Previously, we enabled this option only for releases.

PR Close #22812

packages/language-service/test/BUILD.bazel

@@ -1,5 +1,4 @@
-load("//tools:defaults.bzl", "ts_library")
-load("@build_bazel_rules_typescript//:defs.bzl", "ts_web_test")
+load("//tools:defaults.bzl", "ts_library", "ts_web_test")
 load("@build_bazel_rules_nodejs//:defs.bzl", "jasmine_node_test")
 
 ts_library(
@@ -16,10 +15,9 @@ ts_library(
 jasmine_node_test(
     name = "test",
     bootstrap = ["angular/tools/testing/init_node_spec.js"],
-    # dissable since tests are running but not yet passing
+    # disable since tests are running but not yet passing
     tags = ["manual"],
     deps = [
-        ":test_lib",
         "//tools/testing:node",
     ],
 )