trying to add logging for OCaml RPC calls

[aryx]

test plan:

$ SEMGREP_LOG_SRCS=.* semgrep --test go/lang/correctness/permissions/ --debug
...
calling OCaml via rpc

but I don't see any logs from the OCaml side :(

[github-actions]

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[aryx]

if I put in ocaml.py to the call to subprocess.Popen(..., stderr=sys.stderr),
then the RPC autofix does not seem to work @nmote .
Any idea how we can enable logging for the ocaml side of the RPC so we can use Logs.xxx or Log.xxx
in src/rpc/?

[github-actions]

📸 The pytest shapshots changed in your PR.
Please carefully review these changes and make sure they are intended:

1. Review the changes at c8c0325

2. Accept the new snapshots with

   git fetch origin && git cherry-pick c8c0325 && git push
   

[nmote]

I would have thought that setting stderr the way you describe would have done the trick... I will try to take a stab at this next week if you don't figure it out before then.