fix(ext/process): tolerate unlinked cwd in spawn (#33587)
## Summary
Enables `test-cwd-enoent-repl` in node_compat suite.
## Test plan
- [x] `cargo test --test node_compat -- test-cwd-enoent-repl`
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Co-authored-by: Divy Srivastava <me@littledivy.com>
