[fuchsia] Run v8_unittests via its CFv1 component manifest.

Bug: chromium:1296220
Change-Id: I8af141dc61a7abb31b460c5e43248aaef29aaf84
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3455423
Auto-Submit: Greg Thompson <grt@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79045}

test/unittests/BUILD.gn

@@ -16,6 +16,7 @@ if (is_fuchsia) {
 
   fuchsia_package_runner("v8_unittests_fuchsia") {
     testonly = true
+    use_cfv2 = false
     package = ":v8_unittests_pkg"
     package_name_override = "v8_unittests"
   }