fix(Hydration): implement proper check for __asyncHydrate

[Tofandel]

Fixes #11793

Simply add a proper check on the existance of __asyncHydrate so that vue 3.5 and vue3-lazy-hydration can coexist until we get vue3-lazy-hydration up to date with the new hydration api

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+18 B)	37.7 kB (+3 B)	34 kB (-40 B)
vue.global.prod.js	159 kB (+18 B)	57.6 kB (+3 B)	51.3 kB (-25 B)

Usages

Name	Size	Gzip	Brotli
createApp	55.3 kB (+18 B)	21.3 kB (+4 B)	19.4 kB (-44 B)
createSSRApp	59.3 kB (+18 B)	23 kB (+2 B)	20.9 kB (-57 B)
defineCustomElement	60 kB (+18 B)	22.8 kB (+5 B)	20.7 kB (-51 B)
overall	69.1 kB (+18 B)	26.3 kB (+2 B)	24 kB (+23 B)

[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/compat

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@vue/shared

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vue

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commit: 8b91ef8

[edison1105]

I’m not sure if this fix is necessary, but you make a good point.
It seems that vue3-lazy-hydration hasn’t been adapted for 3.5

[yyx990803]

#11793 (comment)