build: move repeated tsconfig attributes to a macro (#20964)

This helps ensure we use the same tsconfig.json file for all compilations.
Next steps are to make it the same tsconfig.json file used by the editor

PR Close #20964

tools/testing/BUILD.bazel

@@ -1,12 +1,11 @@
 package(default_visibility = ["//visibility:public"])
 
-load("@build_bazel_rules_typescript//:defs.bzl", "ts_library")
+load("//tools:defaults.bzl", "ts_library")
 
 ts_library(
     name = "browser",
     testonly = 1,
     srcs = ["init_browser_spec.ts"],
-    tsconfig = "//packages:tsconfig",
     deps = [
         "//packages/core/testing",
         "//packages/platform-browser-dynamic/testing",
@@ -18,7 +17,6 @@ ts_library(
     name = "node",
     testonly = 1,
     srcs = ["init_node_spec.ts"],
-    tsconfig = "//packages:tsconfig",
     deps = [
         "//packages/core/testing",
         "//packages/platform-server",