[python] Fixes endpoint overload type hint + required property not in properties (#13790)

* Adds endpoint overload type hint fix to template

* Samples regenerated

* Adds fix for required property not in properties

* Regenerates samples

modules/openapi-generator/src/main/resources/python/endpoint_args.handlebars

@@ -73,6 +73,12 @@
         {{/eq}}
         {{/with}}
     {{/if}}
+{{else}}
+    {{#if isOverload}}
+        {{#eq skipDeserialization "True"}}
+    skip_deserialization: typing_extensions.Literal[True],
+        {{/eq}}
+    {{/if}}
 {{/if}}
 {{#if queryParams}}
     query_params: RequestQueryParams = frozendict.frozendict(),

modules/openapi-generator/src/main/resources/python/model_templates/new.handlebars

@@ -17,7 +17,15 @@ def __new__(
 {{#if complexType}}
     {{baseName}}: '{{complexType}}',
 {{else}}
+    {{#if getSchemaIsFromAdditionalProperties}}
+        {{#if addPropsUnset}}
+    {{baseName}}: typing.Union[schemas.AnyTypeSchema, {{> model_templates/schema_python_types }}],
+        {{else}}
+    {{baseName}}: typing.Union[MetaOapg.additional_properties, {{> model_templates/schema_python_types }}],
+        {{/if}}
+    {{else}}
     {{baseName}}: typing.Union[MetaOapg.properties.{{baseName}}, {{> model_templates/schema_python_types }}],
+    {{/if}}
 {{/if}}
 {{/unless}}
 {{/with}}

modules/openapi-generator/src/main/resources/python/model_templates/schema_dict.handlebars

@@ -32,4 +32,8 @@ class {{> model_templates/classname }}(
 {{/if}}
     {{> model_templates/property_type_hints }}
 
+{{#if additionalProperties}}
     {{> model_templates/new }}
+{{else}}
+    {{> model_templates/new addPropsUnset=true }}
+{{/if}}

modules/openapi-generator/src/test/resources/3_0/python/petstore-with-fake-endpoints-models-for-testing-with-http-signature.yaml

@@ -2978,4 +2978,17 @@ components:
           $ref: "#/components/schemas/ArrayWithValidationsInItems"
       required:
         - from
-        - "!reference"
+        - "!reference"
+    ObjectWithOptionalTestProp:
+      type: object
+      properties:
+        test:
+          type: string
+    ObjectWithAllOfWithReqTestPropFromUnsetAddProp:
+      allOf:
+        - $ref: '#/components/schemas/ObjectWithOptionalTestProp'
+        - type: object
+          required: [ test ]
+          properties:
+            name:
+              type: string