fix(pipeline): correct API endpoint for stopping workflow runs

web/app/components/rag-pipeline/hooks/use-pipeline-run.ts

@@ -289,7 +289,7 @@ export const usePipelineRun = () => {
   const handleStopRun = useCallback((taskId: string) => {
     const { pipelineId } = workflowStore.getState()
 
-    stopWorkflowRun(`/rag/pipeline/${pipelineId}/workflow-runs/tasks/${taskId}/stop`)
+    stopWorkflowRun(`/rag/pipelines/${pipelineId}/workflow-runs/tasks/${taskId}/stop`)
   }, [workflowStore])
 
   const handleRestoreFromPublishedWorkflow = useCallback((publishedWorkflow: VersionHistory) => {