refactor(icons): change React import to type import in code generation files

Author: quqjp

packages/component-icons/codegen.cjs

@@ -41,7 +41,7 @@ function generateIconFile(key, value) {
 * NOTE: This file is auto generated
 * Do not edit manually.
 */
-import React from 'react';
+import type React from 'react';
 
 export const ${componentName}: React.ReactElement = (
   ${value}

packages/component-icons/template.ejs

@@ -2,7 +2,7 @@
 * NOTE: This class is auto generated by /zenkigen/workplace-frontend/packages/component-icon
 * Do not edit the class manually.
 */
-import React from 'react';
+import type React from 'react';
 
 export type IconName = <%- result.map(({ key }) => `'${key}'`).join(' | ') %>;