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-server/test/BUILD.bazel

@@ -1,5 +1,4 @@
 load("//tools:defaults.bzl", "ts_library")
-load("@build_bazel_rules_typescript//:defs.bzl", "ts_web_test")
 load("@build_bazel_rules_nodejs//:defs.bzl", "jasmine_node_test")
 
 ts_library(