fix(compiler-core): Properly handle v-for and ref on templates

[baiwusanyu-c]

close: #8395

[baiwusanyu-c]

The implementation of this unit test is very inelegant, I think I need some guidance

[Alfred-Skyblue]

expect(slots).toHaveProperty('arguments[1].elements[0].arguments[1].returns.properties[1].value.returns[0].codegenNode.props.properties[0]',spy)

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	89.5 kB	34 kB	30.7 kB
vue.global.prod.js	147 kB (+167 B)	53.4 kB (+50 B)	47.6 kB (-15 B)

Usages

Name	Size	Gzip	Brotli
createApp	49.8 kB	19.5 kB	17.8 kB
createSSRApp	53.1 kB	20.8 kB	19 kB
defineCustomElement	52.1 kB	20.3 kB	18.5 kB
overall	63.3 kB	24.4 kB	22.3 kB

[skirtles-code]

I just tried to test this fix in the Playground preview, but I'm getting an error in the console:

• Playground

I'm not exactly sure why, but it seems that child.codegenNode is undefined in some scenarios, leading to the error. I see the same error if I test this PR with the original reproduction on the issue.

Also, from what I can tell, this fix is only considering top-level ref attributes within a slot. e.g.:

• Playground