[inspector] Do not resurrect Script objects.

Previously, the inspector would resurrect `v8::internal::Script` objects
when the weak callback is invoked, in order to access their fields and
read out the source (either a String in case of JavaScript or the module
bytes in case of WebAssembly). With https://crrev.com/c/3494242 we no
longer need to access the `v8::internal::Script` now, and so we can stop
relying on the `WeakCallbackType::kFinalizer` logic.

Bug: chromium:1295659
Fixed: chromium:1302195
Doc: https://bit.ly/v8-inspector-script-caching
Change-Id: I6a444bfcdf6cd23b30043f7386d6c18b7afec659
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3497324Reviewed-by: Simon Zünd <szuend@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79366}

src/inspector/v8-debugger-script.cc

@@ -326,11 +326,11 @@ class ActualScript : public V8DebuggerScript {
         [](const v8::WeakCallbackInfo<ActualScript>& data) {
           data.GetParameter()->WeakCallback();
         },
-        v8::WeakCallbackType::kFinalizer);
+        v8::WeakCallbackType::kParameter);
   }
 
   void WeakCallback() {
-    m_script.ClearWeak();
+    m_script.Reset();
     m_agent->ScriptCollected(this);
   }