Fix GetBudget endpoint to return BudgetWithEntries instead of BudgetValidationRequest (#3119)

Co-authored-by: ci.datadog-api-spec <packages@datadoghq.com>

Author: api-clients-generation-pipeline[bot]

.generator/schemas/v2/openapi.yaml

@@ -71515,7 +71515,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: '#/components/schemas/BudgetValidationRequest'
+                $ref: '#/components/schemas/BudgetWithEntries'
           description: OK
         '429':
           $ref: '#/components/responses/TooManyRequestsResponse'

src/datadog_api_client/v2/api/cloud_cost_management_api.py

@@ -320,7 +320,7 @@ def __init__(self, api_client=None):
 
         self._get_budget_endpoint = _Endpoint(
             settings={
-                "response_type": (BudgetValidationRequest,),
+                "response_type": (BudgetWithEntries,),
                 "auth": ["apiKeyAuth", "appKeyAuth"],
                 "endpoint_path": "/api/v2/cost/budget/{budget_id}",
                 "operation_id": "get_budget",
@@ -1095,14 +1095,14 @@ def delete_tag_pipelines_ruleset(
     def get_budget(
         self,
         budget_id: str,
-    ) -> BudgetValidationRequest:
+    ) -> BudgetWithEntries:
         """Get budget.
 
         Get a budget
 
         :param budget_id: Budget id.
         :type budget_id: str
-        :rtype: BudgetValidationRequest
+        :rtype: BudgetWithEntries
         """
         kwargs: Dict[str, Any] = {}
         kwargs["budget_id"] = budget_id