fix(watch): once option should be ignored by watchEffect

[yangmingshan]

Ref: https://github.com/vuejs/core/blob/main/packages/runtime-core/src/apiWatch.ts#L161

v3.4.38: https://github.com/vuejs/core/blob/v3.4.38/packages/runtime-core/src/apiWatch.ts#L183

cc @LittleSound

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (-33 B)	37.7 kB (-10 B)	34 kB (+5 B)
vue.global.prod.js	159 kB (-33 B)	57.6 kB (-12 B)	51.2 kB (-122 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	48.8 kB	18.8 kB	17.2 kB
createApp	55.3 kB (-33 B)	21.2 kB (-5 B)	19.4 kB (-41 B)
createSSRApp	59.2 kB (-33 B)	22.9 kB (-6 B)	20.9 kB (+36 B)
defineCustomElement	60 kB (-33 B)	22.8 kB (-7 B)	20.7 kB (-6 B)
overall	69 kB (-33 B)	26.3 kB (-5 B)	23.9 kB (+32 B)

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commit: 9cbef6f

[edison1105]

LGTM.

once: (3.4+) run the callback only once. The watcher is automatically stopped after the first callback run.

we should follow the document. https://vuejs.org/api/reactivity-core.html#watch