fix: Call json_safe on globals in codejail remote_exec

[timmc-edx]

We need to make globals JSON-friendly before sending them across the network.

Addresses edx/edx-arch-experiments#1016

[timmc-edx]

@MoisesGSalas Tagging you since this might be relevant to your deployment. I'd be curious if you've seen any of these errors. Here's a sample of what they look like (though the error message itself will differ if you're calling remote directly instead of calling it via darklaunch):

Apr 15 16:05:23 ip-XXXXX [service_variant=lms][xmodule.capa.safe_exec.safe_exec][env:prod-edx-edxapp] ERROR [ip-XXXXX  63040] [user XXXXX] [ip XXXXX] [safe_exec.py:233] - Error occurred while trying to remote exec in dark launch mode.
Traceback (most recent call last):
  File "/edx/app/edxapp/edx-platform/xmodule/capa/safe_exec/safe_exec.py", line 222, in safe_exec
    remote_emsg, _remote_exception = get_remote_exec(data)
                                     ^^^^^^^^^^^^^^^^^^^^^
  File "/edx/app/edxapp/edx-platform/xmodule/capa/safe_exec/remote_exec.py", line 72, in get_remote_exec
    return remote_exec_function(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/edx/app/edxapp/edx-platform/xmodule/capa/safe_exec/remote_exec.py", line 93, in send_safe_exec_request_v0
    payload = json.dumps(data)
              ^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/json/encoder.py", line 200, in encode
    chunks = self.iterencode(o, _one_shot=True)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/json/encoder.py", line 258, in iterencode
    return _iterencode(o, 0)
           ^^^^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/json/encoder.py", line 180, in default
    raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type bytes is not JSON serializable

We've seen very few of these, so they may be specific to some custom XBlock.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX staging environment in preparation for a release to production.

[edx-pipeline-bot]

2U Release Notice: This PR has been deployed to the edX production environment.

[MoisesGSalas]

Hi @timmc-edx, sorry for the late response. I did a quick check on the instances that use codejail the most but none had any serialization errors.

[timmc-edx]

Thanks for the update!