fix(runtime-core): handle validate prop check edge case

[edison1105]

close #12234

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB	38 kB	34.2 kB
vue.global.prod.js	159 kB	57.9 kB	51.4 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.9 kB	18.3 kB	16.7 kB
createApp	55 kB	21.3 kB	19.4 kB
createSSRApp	59 kB	23 kB	20.9 kB
defineCustomElement	59.8 kB	22.8 kB	20.8 kB
overall	68.7 kB	26.3 kB	24 kB

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commit: 8e6a77d

[skirtles-code]

There are a couple of existing PRs that seem to be trying to solve the same problem: #8539 and #7809. I'm not entirely sure which approach is best, perhaps a combination?

[skirtles-code]

I think this check needs to come first, otherwise it'll still fail when a Symbol is passed for a prop with type: String.