feat: Add codejail darklaunch toggle.

This adds a toggle for running codejail in both remote
and local configurations for testing purposes.

edx/edx-arch-experiments#895

xmodule/capa/safe_exec/remote_exec.py

@@ -29,11 +29,31 @@
     "ENABLE_CODEJAIL_REST_SERVICE", default=False, module_name=__name__
 )
 
+# .. toggle_name: ENABLE_CODEJAIL_DARKLAUNCH
+# .. toggle_implementation: SettingToggle
+# .. toggle_default: False
+# .. toggle_description: Turn on to send requests to both the codejail service and the installed codejail library for
+#   testing and evaluation purposes.
+# .. toggle_warning: This toggle will only behave as expected when ENABLE_CODEJAIL_REST_SERVICE is not enabled and when
+#   CODE_JAIL_REST_SERVICE_REMOTE_EXEC, CODE_JAIL_REST_SERVICE_HOST, CODE_JAIL_REST_SERVICE_READ_TIMEOUT,
+#   and CODE_JAIL_REST_SERVICE_CONNECT_TIMEOUT are configured.
+# .. toggle_use_cases: temporary
+# .. toggle_creation_date: 2025-04-03
+# .. toggle_target_removal_date: 2025-05-01
+ENABLE_CODEJAIL_DARKLAUNCH = SettingToggle(
+    "ENABLE_CODEJAIL_DARKLAUNCH", default=False, module_name=__name__
+)
+
 
 def is_codejail_rest_service_enabled():
     return ENABLE_CODEJAIL_REST_SERVICE.is_enabled()
 
 
+# This toggle assumes that ENABLE_CODEJAIL_REST_SERVICE is not enabled.
+def is_codejail_in_darklaunch():
+    return ENABLE_CODEJAIL_DARKLAUNCH.is_enabled()
+
+
 def get_remote_exec(*args, **kwargs):
     """Get remote exec function based on setting and executes it."""
     remote_exec_function_name = settings.CODE_JAIL_REST_SERVICE_REMOTE_EXEC

xmodule/capa/safe_exec/safe_exec.py

@@ -7,7 +7,7 @@
 from edx_django_utils.monitoring import function_trace
 
 from . import lazymod
-from .remote_exec import is_codejail_rest_service_enabled, get_remote_exec
+from .remote_exec import is_codejail_rest_service_enabled, is_codejail_in_darklaunch, get_remote_exec
 
 # Establish the Python environment for Capa.
 # Capa assumes float-friendly division always.
@@ -155,6 +155,21 @@ def safe_exec(
         emsg, exception = get_remote_exec(data)
 
     else:
+        # Run the code in both the remote codejail service as well as the local codejail
+        # when in darklaunch mode.
+        if is_codejail_in_darklaunch():
+            data = {
+                "code": code_prolog + LAZY_IMPORTS + code,
+                "globals_dict": globals_dict,
+                "python_path": python_path,
+                "limit_overrides_context": limit_overrides_context,
+                "slug": slug,
+                "unsafely": unsafely,
+                "extra_files": extra_files,
+            }
+
+            emsg, exception = get_remote_exec(data)
+
         # Decide which code executor to use.
         if unsafely:
             exec_fn = codejail_not_safe_exec