fix(runtime-vapor): more accurate fallthrough attr support

[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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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	84.3 kB (+322 B)	29.9 kB (+94 B)	26.4 kB (+56 B)
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: 7a7d995

[edison1105]

The following scenarios need to be fixed

• Playground - vdom component
• Playground with this PR - vapor component

[alex-snezhko]

@edison1105 updated and edited the PR title!

[alex-snezhko]

This is unused so I removed it; it gets sent as an argument to setDynamicProps but the param was removed in this commit

[alex-snezhko]

Also removed due to being unused