Feat: Remove begin's width from agent templates #4764 (#4809)

### What problem does this PR solve?

Feat: Remove begin's width from agent templates #4764
### Type of change


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

agent/templates/HR_callout_zh.json

           "selected": false,
           "sourcePosition": "left",
           "targetPosition": "right",
-          "type": "beginNode",
-          "width": 100
+          "type": "beginNode"
         },
         {
           "data": {

agent/templates/customer_service.json

           "selected": false,
           "sourcePosition": "left",
           "targetPosition": "right",
-          "type": "beginNode",
-          "width": 100
+          "type": "beginNode"
         },
         {
           "data": {

agent/templates/general_chat_bot.json

           "selected": false,
           "sourcePosition": "left",
           "targetPosition": "right",
-          "type": "beginNode",
-          "width": 100
+          "type": "beginNode"
         },
         {
           "data": {

agent/templates/investment_advisor.json

             "selected": false,
             "sourcePosition": "left",
             "targetPosition": "right",
-            "type": "beginNode",
-            "width": 100
+            "type": "beginNode"
           },
           {
             "data": {

agent/templates/medical_consultation.json

             "selected": false,
             "sourcePosition": "left",
             "targetPosition": "right",
-            "type": "beginNode",
-            "width": 100
+            "type": "beginNode"
           },
           {
             "data": {

agent/templates/text2sql.json

           "selected": false,
           "sourcePosition": "left",
           "targetPosition": "right",
-          "type": "beginNode",
-          "width": 100
+          "type": "beginNode"
         },
         {
           "data": {

agent/templates/websearch_assistant.json

           "selected": false,
           "sourcePosition": "left",
           "targetPosition": "right",
-          "type": "beginNode",
-          "width": 100
+          "type": "beginNode"
         },
         {
           "data": {