revert(core): cleanup imports from vueuse/core that exist in vue

This reverts commit 7cc798ad

packages/core/src/components/Edges/EdgeLabelRenderer.vue

@@ -1,5 +1,5 @@
 <script lang="ts" setup>
-import { toRef } from 'vue'
+import { toRef } from '@vueuse/core'
 import { useVueFlow } from '../../composables'
 
 const { viewportRef } = useVueFlow()

packages/core/src/components/Handle/Handle.vue

@@ -1,6 +1,6 @@
 <script lang="ts" setup>
-import { until } from '@vueuse/core'
-import { computed, onUnmounted, ref, toRef } from 'vue'
+import { toRef, until } from '@vueuse/core'
+import { computed, onUnmounted, ref } from 'vue'
 import type { HandleProps } from '../../types/handle'
 import { Position } from '../../types'
 import { useHandle, useNode, useVueFlow } from '../../composables'