cppgc: Fix compilation on gcc

Currently getting the following 2 errors:
```
error: reference to 'MarkingType' is ambiguous
error: reference to 'SweepingType' is ambiguous
```

Change-Id: Ia50d1b5ea8af0fcc85acb9c0dc5cfae1956cec62
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3540624Reviewed-by: Shu-yu Guo <syg@chromium.org>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79556}

test/unittests/heap/cppgc/prefinalizer-unittest.cc

@@ -412,8 +412,8 @@ TEST_F(PrefinalizerTest, GCBeforePrefinalizerRegistration) {
     internal::Heap::From(GetHeap())->CollectGarbage(
         {internal::GarbageCollector::Config::CollectionType::kMajor,
          cppgc::Heap::StackState::kMayContainHeapPointers,
-         Heap::MarkingType::kAtomic,
-         Heap::SweepingType::kIncrementalAndConcurrent,
+         cppgc::Heap::MarkingType::kAtomic,
+         cppgc::Heap::SweepingType::kIncrementalAndConcurrent,
          internal::GarbageCollector::Config::FreeMemoryHandling::
              kDiscardWherePossible,
          internal::GarbageCollector::Config::IsForcedGC::kForced});