Refactor: Move "exe_args" from "model" to "run_settings" object in manifest.json

[MattToast]

Description

Currently in the agreed upon structure for the manifest.json file that is used as a handshake between SS and SSDash, the model.run_settings.exec_args list of strings is serialized under the manifest["runs"][index]["model"][index_2]["exe_args"] instead of under a ...[index_2]["run_settings"]["exe_args"]. We should consider moving this information there.

Justification

In memory, SmartSim has exe_args: list[str] as an attr on RunSettings. Ideally the manifest.json should follow the structure of SS's data structures as that makes serialization easier, and reduces the amount of context switching that needs to be done by developers.

Refactor for SS

At time of writing (likely that it has moved in push for MVP):

--- a/smartsim/_core/utils/serialize.py
+++ b/smartsim/_core/utils/serialize.py
@@ -96,7 +96,6 @@ def _dictify_model(
     return {
         "name": model.name,
         "path": model.path,
-        "exe_args": model.run_settings.exe_args,
         "run_settings": _dictify_run_settings(model.run_settings),
         "batch_settings": _dictify_batch_settings(model.batch_settings)
         if model.batch_settings
@@ -171,8 +170,7 @@ def _dictify_ensemble(
 def _dictify_run_settings(run_settings: RunSettings) -> t.Dict[str, t.Any]:
     return {
         "exe": run_settings.exe,
-        # TODO: We should try to move this back
-        # "exe_args": run_settings.exe_args,
+        "exe_args": run_settings.exe_args,
         "run_command": run_settings.run_command,
         "run_args": run_settings.run_args,
         # TODO: We currently do not have a way to represent MPMD commands!

Refactor for SSDash

At time of writing (VERY likely to change in push for an MVP):

--- a/smartdashboard/utils/helpers.py
+++ b/smartdashboard/utils/helpers.py
@@ -28,10 +28,8 @@ def get_exe_args(entity: Optional[Dict[str, Any]]) -> List[str]:
     :return: exe_args of the entity
     :rtype: List[str]
     """
-    if entity:
-        return list(entity.get("exe_args", []))
-
-    return []
+    rs = dict((entity or {}).get("run_settings", {}))
+    return list(rs.get("exe_args", []))