fix(runtime-core): allow symbol values for slot prop key

[jh-leong]

close #12068

Ensure unique slot keys by using the slot’s name when the key is a Symbol, without converting it to a string.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	101 kB (+12 B)	38.1 kB (+12 B)	34.2 kB (+11 B)
vue.global.prod.js	160 kB (+12 B)	58 kB (+11 B)	51.5 kB (-68 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	49.1 kB	18.9 kB	17.3 kB
createApp	55.7 kB	21.4 kB	19.6 kB
createSSRApp	59.7 kB	23.1 kB	21 kB
defineCustomElement	60.4 kB	23 kB	20.9 kB
overall	69.4 kB	26.5 kB	24.1 kB

[pkg-pr-new]

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@vue/compiler-core

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@vue/compiler-dom

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@vue/compiler-sfc

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@vue/compiler-ssr

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@vue/reactivity

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@vue/runtime-dom

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@vue/runtime-core

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@vue/server-renderer

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@vue/shared

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vue

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@vue/compat

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commit: 3cdd1df