fix(compiler-vapor): prevent v-for components from being single root

[runyasak]

This PR is related to vuejs/vue-vapor#299.

Summary

This PR continues the work from vuejs/vue-vapor#305 to fix an issue where components with v-for directives were incorrectly marked as single root components in vapor mode.

Overview

As noted in the original PR, when a component has only a single root element, the fourth argument is included in createComponent. However, if there are multiple elements or if the component uses v-for, it should not be marked as a single root.

Scope of work

Added hasVFor check to detect components with v-for directives.

Example

<template>
  <Comp v-for="item in items" :key="item" />
</template>

Now correctly compiles without marking the component as a single root.

Additional Notes

The previous PR in vue-vapor was closed as the work has moved to the vapor branch in the core repository. This PR implements the same fix but in the current development location.

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commit: a951a73