[fuchsia] Include what you use fixes in test/unittests/BUILD.gn

Bug: chromium:1092804
Change-Id: I9f4385d00af464eb2b9251b7c1dcfe0d4b69cdf2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3891279
Auto-Submit: Greg Thompson <grt@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83182}

test/unittests/BUILD.gn

@@ -5,7 +5,9 @@
 import("../../gni/v8.gni")
 
 if (is_fuchsia) {
-  import("//build/config/fuchsia/rules.gni")
+  import("//build/config/fuchsia/generate_runner_scripts.gni")
+  import("//third_party/fuchsia-sdk/sdk/build/component.gni")
+  import("//third_party/fuchsia-sdk/sdk/build/package.gni")
 
   fuchsia_component("v8_unittests_component") {
     testonly = true