chore: enable import/no-duplicates eslint rule (#8199)

Author: antfu

.eslintrc.cjs

@@ -89,6 +89,7 @@ module.exports = defineConfig({
       { prefer: 'type-imports' }
     ],
 
+    'import/no-duplicates': 'error',
     'import/order': 'error',
     'sort-imports': [
       'error',

packages/plugin-vue/src/index.ts

@@ -1,13 +1,15 @@
 import fs from 'fs'
 import type { Plugin, ViteDevServer } from 'vite'
 import { createFilter } from '@rollup/pluginutils'
+/* eslint-disable import/no-duplicates */
 import type {
   SFCBlock,
   SFCScriptCompileOptions,
   SFCStyleCompileOptions,
   SFCTemplateCompileOptions
 } from 'vue/compiler-sfc'
 import type * as _compiler from 'vue/compiler-sfc'
+/* eslint-enable import/no-duplicates */
 import { resolveCompiler } from './compiler'
 import { parseVueRequest } from './utils/query'
 import { getDescriptor, getSrcDescriptor } from './utils/descriptorCache'