[test] Fix StressJS

CodePageCollectionMemoryModificationScope was wrongly added to the test.
On M1, the code object is unprotected to RW and crash when running it later.

Bug: v8:12386, v8:12396
Change-Id: I1af3dabaa9b66d1f50033f298107949fcb35c3d0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3289155Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77947}

test/cctest/heap/test-alloc.cc

@@ -134,7 +134,6 @@ TEST(StressJS) {
   FLAG_stress_concurrent_allocation = false;
   Isolate* isolate = CcTest::i_isolate();
   Factory* factory = isolate->factory();
-  CodePageCollectionMemoryModificationScope code_scope(isolate->heap());
   v8::HandleScope scope(CcTest::isolate());
   v8::Local<v8::Context> env = v8::Context::New(CcTest::isolate());
   env->Enter();