[cctest] Move most heap related tests to test/cctest/heap and clean wrt IWYU

test/cctest/heap/heap-tester.h

Index: test/cctest/heap/heap-tester.h
diff --git a/test/cctest/heap-tester.h b/test/cctest/heap/heap-tester.h
similarity index 97%
rename from test/cctest/heap-tester.h
rename to test/cctest/heap/heap-tester.h
index bb26b5a77584e44144969a12f5584a65b772eee5..f2a1a243c993e1160f8f0403e2fea2805a0bc6ae 100644
--- a/test/cctest/heap-tester.h
+++ b/test/cctest/heap/heap-tester.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef HEAP_TESTER_H_
-#define HEAP_TESTER_H_
+#ifndef HEAP_HEAP_TESTER_H_
+#define HEAP_HEAP_TESTER_H_
 
 #include "src/handles.h"
 #include "src/heap/spaces.h"
@@ -79,4 +79,4 @@ class HeapTester {
 }  // namespace internal
 }  // namespace v8
 
-#endif  // HEAP_TESTER_H_
+#endif  // HEAP_HEAP_TESTER_H_