[python][client] Clean up samples and CI (#17509)

* chore: Remove leftover Github action file

This was probably added by mistake. A similar file is active in
.github/workflows/samples-python-pydantic-v1-petstore.yaml.

* chore: Remove leftover VERSION from old python-experimental sample

* ci: Stop running Python integration tests in Circle CI

These Python clients are all tested with Github Actions already, which
is faster, more cleanly separated and only runs on modifications.

I'm not cleaning up the pydantic-v1 client, I expect it to be removed soon anyway.

* chore: Remove true from sample folder name

python-disallowAdditionalPropertiesIfNotPresent-true
-> python-disallowAdditionalPropertiesIfNotPresent

samples/client/echo_api/python-disallowAdditionalPropertiesIfNotPresent/docs/DataQuery.md

@@ -0,0 +1,31 @@
+# DataQuery
+
+
+## Properties
+
+Name | Type | Description | Notes
+------------ | ------------- | ------------- | -------------
+**suffix** | **str** | test suffix | [optional] 
+**text** | **str** | Some text containing white spaces | [optional] 
+**var_date** | **datetime** | A date | [optional] 
+
+## Example
+
+```python
+from openapi_client.models.data_query import DataQuery
+
+# TODO update the JSON string below
+json = "{}"
+# create an instance of DataQuery from a JSON string
+data_query_instance = DataQuery.from_json(json)
+# print the JSON string representation of the object
+print DataQuery.to_json()
+
+# convert the object into a dict
+data_query_dict = data_query_instance.to_dict()
+# create an instance of DataQuery from a dict
+data_query_form_dict = data_query.from_dict(data_query_dict)
+```
+[[Back to Model list]](../README.md#documentation-for-models) [[Back to API list]](../README.md#documentation-for-api-endpoints) [[Back to README]](../README.md)
+
+