refactor(templateRef): simplify template ref handling and remove old ref declarations

[edison1105]

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Size Report

Bundles

File	Size	Gzip	Brotli
compiler-dom.global.prod.js	84 kB	29.8 kB	26.3 kB
runtime-dom.global.prod.js	104 kB	39.1 kB	35.3 kB
vue.global.prod.js	162 kB	59.3 kB	52.9 kB

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	47.2 kB	18.4 kB	16.9 kB
createApp	56 kB	21.6 kB	19.7 kB
createApp + vaporInteropPlugin	68.6 kB	25.9 kB	23.6 kB
createVaporApp	20.9 kB	8.26 kB	7.57 kB
createSSRApp	60.3 kB	23.3 kB	21.3 kB
defineCustomElement	61 kB	23.1 kB	21.1 kB
overall	70.5 kB	26.8 kB	24.4 kB

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commit: fcfdcbf

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