fix(runtime-core): handle ref unmounting in conditional updates

[inottn]

fix #12898

[pkg-pr-new]

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@vue/compiler-core

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@vue/compiler-dom

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@vue/compiler-ssr

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@vue/compiler-sfc

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@vue/reactivity

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@vue/runtime-core

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@vue/runtime-dom

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@vue/server-renderer

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@vue/shared

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@vue/compat

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vue

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commit: c30b8c2

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+46 B)	38.1 kB (+19 B)	34.4 kB (+38 B)
vue.global.prod.js	158 kB (+46 B)	58 kB (+22 B)	51.6 kB (+5 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.6 kB (+46 B)	18.3 kB (+17 B)	16.7 kB (+16 B)
createApp	54.6 kB (+46 B)	21.3 kB (+18 B)	19.5 kB (+15 B)
createSSRApp	58.8 kB (+46 B)	23 kB (+16 B)	21 kB (+23 B)
defineCustomElement	59.4 kB (+46 B)	22.9 kB (+17 B)	20.8 kB (+12 B)
overall	68.7 kB (+46 B)	26.5 kB (+21 B)	24 kB (+18 B)