Protect system processes calls

With the upcoming Emacs 29, system process functions like `list-system-processes` and `process-attributes` work on the remote host when `default-directory` is remote. In order to avoid this, wrap the respective code by

```
(let ((default-directory temporary-file-directory))
...)

```

Search the Emacs Lisp sources for the calls to `list-system-processes` and `process-attributes`, then inspect how `default-directory` is set around them. Verify that both system-process operations use `temporary-file-directory` when the original directory is remote, without changing unrelated process behavior.

Written by the indexing model from the issue text.