feat: code transform node editor support insert var by add slash or left brace (#3946)

Co-authored-by: StyleZhang <jasonapring2015@outlook.com>

web/i18n/en-US/workflow.ts

@@ -49,6 +49,7 @@ const translation = {
     processData: 'Process Data',
     input: 'Input',
     output: 'Output',
+    jinjaEditorPlaceholder: 'Type \'/\' or \'{\' to insert variable',
     viewOnly: 'View Only',
     showRunHistory: 'Show Run History',
   },

web/i18n/zh-Hans/workflow.ts

@@ -49,6 +49,7 @@ const translation = {
     processData: '数据处理',
     input: '输入',
     output: '输出',
+    jinjaEditorPlaceholder: '输入 “/” 或 “{” 插入变量',
     viewOnly: '只读',
     showRunHistory: '显示运行历史',
   },