Feat: When exporting the agent DSL, the tailkey, password, and history fields need to be cleared. #13281 (#13282)

### What problem does this PR solve?
Feat: When exporting the agent DSL, the tailkey, password, and history
fields need to be cleared. #13281

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>

web/src/constants/agent.tsx

@@ -228,3 +228,49 @@ export const initialBeginValues = {
   mode: AgentDialogueMode.Conversational,
   prologue: `Hi! I'm your assistant. What can I do for you?`,
 };
+
+export const BeginId = 'begin';
+
+export const EmptyDsl = {
+  graph: {
+    nodes: [
+      {
+        id: BeginId,
+        type: 'beginNode',
+        position: {
+          x: 50,
+          y: 200,
+        },
+        data: {
+          label: 'Begin',
+          name: 'begin',
+          form: initialBeginValues,
+        },
+        sourcePosition: 'left',
+        targetPosition: 'right',
+      },
+    ],
+    edges: [],
+  },
+  components: {
+    begin: {
+      obj: {
+        component_name: 'Begin',
+        params: {},
+      },
+      downstream: [], // other edge target is downstream, edge source is current node id
+      upstream: [], // edge source is upstream, edge target is current node id
+    },
+  },
+  retrieval: [], // reference
+  history: [],
+  path: [],
+  variables: [],
+  globals: {
+    [AgentGlobals.SysQuery]: '',
+    [AgentGlobals.SysUserId]: '',
+    [AgentGlobals.SysConversationTurns]: 0,
+    [AgentGlobals.SysFiles]: [],
+    [AgentGlobals.SysHistory]: [],
+  },
+};