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/platform-browser-dynamic/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(
@@ -30,14 +29,9 @@ jasmine_node_test(
 
 ts_web_test(
     name = "test_web",
-    bootstrap = [
-        "//:web_test_bootstrap_scripts",
-    ],
-    # dissable since tests are running but not yet passing
+    # disable since tests are running but not yet passing
     tags = ["manual"],
-    # do not sort
     deps = [
-        "//tools/testing:browser",
         ":test_lib",
     ],
 )