test: fix test-debugger-heap-profiler for workers

Fix `sequential/test-debugger-heap-profiler` so that it can be run
in a worker thread. `process.chdir()` is not allowed in worker threads
but passing a current working directory into a spawned child process
is allowed.

PR-URL: https://github.com/nodejs/node/pull/39687


Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>