[Fuchsia] Filter failing tests on Fuchsia

This will allow Fuchsia tests to be run on v8 CI

Bug: v8:11843, chromium:934932
Change-Id: I516329d8f29d9c94d46aa010fa729fa3ca0993ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2935024
Commit-Queue: Chong Gu <chonggu@google.com>
Auto-Submit: Chong Gu <chonggu@google.com>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#74993}

test/unittests/heap/unmapper-unittest.cc

@@ -223,6 +223,7 @@ class TrackingPageAllocator : public ::v8::PageAllocator {
   PagePermissionsMap page_permissions_;
 };
 
+#if !V8_OS_FUCHSIA
 class SequentialUnmapperTest : public TestWithIsolate {
  public:
   SequentialUnmapperTest() = default;
@@ -339,6 +340,7 @@ TEST_F(SequentialUnmapperTest, UnmapOnTeardown) {
   tracking_page_allocator()->CheckIsFree(page->address(), page_size);
 #endif  // V8_COMPRESS_POINTERS
 }
+#endif  // !V8_OS_FUCHSIA
 
 }  // namespace internal
 }  // namespace v8