Fix GetBudget endpoint to return BudgetWithEntries instead of BudgetValidationRequest (#3638)

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'

api/datadogV2/api_cloud_cost_management.go

@@ -905,11 +905,11 @@ func (a *CloudCostManagementApi) DeleteTagPipelinesRuleset(ctx _context.Context,
 
 // GetBudget Get budget.
 // Get a budget
-func (a *CloudCostManagementApi) GetBudget(ctx _context.Context, budgetId string) (BudgetValidationRequest, *_nethttp.Response, error) {
+func (a *CloudCostManagementApi) GetBudget(ctx _context.Context, budgetId string) (BudgetWithEntries, *_nethttp.Response, error) {
 	var (
 		localVarHTTPMethod  = _nethttp.MethodGet
 		localVarPostBody    interface{}
-		localVarReturnValue BudgetValidationRequest
+		localVarReturnValue BudgetWithEntries
 	)
 
 	localBasePath, err := a.Client.Cfg.ServerURLWithContext(ctx, "v2.CloudCostManagementApi.GetBudget")