fix(hydration): don't error if data-allow-mismatch provided for fragment

[dmitryuk]

Fixes hydrateFragment method throws hydration mismatch error despite of data-allow-mismatch attribute exists in parent node.

fragment not enough children test was wrong since Hydration completed but contains mismatches. error was ignored in test environment and not checked at all

__TEST__ flag prevented to catch error for testing

added toHaveBeenErrored method that looks same as toHaveBeenWarned, but error level

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+9 B)	37.9 kB (-1 B)	34.2 kB (+22 B)
vue.global.prod.js	158 kB (+9 B)	57.8 kB (+1 B)	51.5 kB (+87 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.6 kB	18.3 kB	16.7 kB
createApp	54.6 kB	21.3 kB	19.4 kB
createSSRApp	58.7 kB (+9 B)	23 kB (+4 B)	20.9 kB (-2 B)
defineCustomElement	59.4 kB	22.8 kB	20.8 kB
overall	68.4 kB	26.4 kB	24 kB

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commit: 9e90946

[edison1105]

Thanks for the PR. I've made some minor tweaks 9e90946
LGTM

[dmitryuk]

@edison1105 thanks you so much for instant help!

I very hope the PR will be merged next release