fix: add missing data dependency to zucchini_integration_test

Our Windows on Arm testing setup relies on using GN to extract the
runtime_deps of each test suite. Adding testdata ensures that it's
appropriately packaged. All tests pass once this is added.

Change-Id: I239fd4b3ec4c044cdc7f40070d45e5155e278217
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2107554Reviewed-by: Etienne Pierre-Doray <etiennep@chromium.org>
Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Cr-Commit-Position: refs/heads/master@{#751455}

components/zucchini/BUILD.gn

@@ -216,6 +216,8 @@ test("zucchini_integration_test") {
     "//base/test:test_support",
     "//testing/gtest",
   ]
+
+  data = [ "testdata" ]
 }
 
 # Group to build and depend on all the Zucchini related fuzzers.