refactor: node::Environment self-cleanup (#39604)

* chore: savepoint

* chore: turn raw_ptr tests back off

shell/renderer/electron_renderer_client.h

@@ -55,7 +55,7 @@ class ElectronRendererClient : public RendererClientBase {
   // The node::Environment::GetCurrent API does not return nullptr when it
   // is called for a context without node::Environment, so we have to keep
   // a book of the environments created.
-  std::set<node::Environment*> environments_;
+  std::set<std::shared_ptr<node::Environment>> environments_;
 
   // Getting main script context from web frame would lazily initializes
   // its script context. Doing so in a web page without scripts would trigger