fix: remove parent_id from create_experiment (#9068)

Follow up for #8927
Since parent id is mostly used internally, and can be confusing for end user when exposed, we decide to remove it from SDK function create_experiment

(cherry picked from commit 1e45918)

harness/determined/common/experimental/determined.py

@@ -125,7 +125,6 @@ def create_experiment(
         config: Union[str, pathlib.Path, Dict],
         model_dir: Optional[Union[str, pathlib.Path]] = None,
         includes: Optional[Iterable[Union[str, pathlib.Path]]] = None,
-        parent_id: Optional[int] = None,
         project_id: Optional[int] = None,
         template: Optional[str] = None,
     ) -> experiment.Experiment:
@@ -139,8 +138,6 @@ def create_experiment(
             model_dir(string, optional): directory containing model definition. (default: ``None``)
             includes(Iterable[Union[str, pathlib.Path]], optional): Additional files or
                 directories to include in the model definition. (default: ``None``)
-            parent_id(int, optional): If specified, the created experiment will use the model
-                definition from the parent experiment. (default: ``None``)
             project_id(int, optional): The id of the project this experiment should belong to.
             (default: ``None``)
             template(string, optional): The name of the template for the experiment.
@@ -176,7 +173,6 @@ def create_experiment(
             activate=True,
             config=config_text,
             modelDefinition=model_context,
-            parentId=parent_id,
             projectId=project_id,
             template=template,
         )

harness/determined/experimental/client.py

@@ -168,7 +168,6 @@ def create_experiment(
     config: Union[str, pathlib.Path, Dict],
     model_dir: Optional[str] = None,
     includes: Optional[Iterable[Union[str, pathlib.Path]]] = None,
-    parent_id: Optional[int] = None,
     project_id: Optional[int] = None,
     template: Optional[str] = None,
 ) -> Experiment:
@@ -178,8 +177,6 @@ def create_experiment(
         config: Experiment config filename (.yaml) or a dict.
         model_dir: Directory containing model definition.
         includes: Additional files or directories to include in the model definition.
-        parent_id: If specified, the created experiment will use the model definition
-            from the parent experiment.
         project_id: The id of the project this experiment should belong to.
         template: The name of the template for the experiment.
             See :ref:`config-template` for more details.
@@ -188,9 +185,7 @@ def create_experiment(
         An :class:`~determined.experimental.client.Experiment` of the created experiment.
     """
     assert _determined is not None
-    return _determined.create_experiment(
-        config, model_dir, includes, parent_id, project_id, template
-    )
+    return _determined.create_experiment(config, model_dir, includes, project_id, template)
 
 
 @_require_singleton