fix(runtime-vapor): fallthrough attrs with comments in template root

[alex-snezhko]

Fix fallthrough attributes in Vapor mode when target component has comments in its template root level

Example
Comp.vue

<template vapor>
  <!--comment-->
  <div>Hello</div>
</template>

App.vue

<script setup vapor>
import Comp from './Comp.vue';
</script>

<template>
  <Comp style="color: red;" />
</template>

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[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	84 kB	29.8 kB	26.3 kB
runtime-dom.global.prod.js	104 kB	39.1 kB	35.3 kB
vue.global.prod.js	162 kB	59.3 kB	52.9 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.2 kB	18.4 kB	16.9 kB
createApp	56 kB	21.6 kB	19.7 kB
createApp + vaporInteropPlugin	68.7 kB (+104 B)	25.9 kB (+31 B)	23.6 kB (+19 B)
createVaporApp	21.1 kB (+104 B)	8.36 kB (+26 B)	7.64 kB (+22 B)
createSSRApp	60.3 kB	23.3 kB	21.3 kB
defineCustomElement	61 kB	23.1 kB	21.1 kB
overall	70.5 kB	26.8 kB	24.4 kB

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commit: 898964c