Revert "Merge pull request #7231 from cloudflare/erikcorry/cppgc-eager-sweeping"

[ObsidianMinor]

This reverts commit 519f66a, reversing changes made to 80c6564.

[ask-bonk]

[HIGH] src/workerd/api/basics.c++:176

A target can now be condemned after its wrapper is collected but before its CppGC shim finalizes. This abort algorithm remains reachable from the live AbortSignal, so tryGet() can return that target with its traced handles already zapped; removeEventListener() then touches V8 state through a dangling wrapper. Promote through tryAddRef(js), as the new WeakRef contract requires.

              KJ_IF_SOME(target, self.tryAddRef(js)) {

[ask-bonk]

I'm Bonk, and I've done a quick review of your PR.

Restores deferred CppGC sweeping and updates JSG wrapper handling for condemned objects.

1. High src/workerd/api/basics.c++:176: an abort algorithm can use a condemned EventTarget through tryGet() and touch zapped V8 state. A suggestion was posted.

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