fix(TransitionGroup): reset prevChildren to prevent memory leak

[edison1105]

close #13181

When the child component is unmounted, the el was retained in prevChildren without being released, causing the memory leak

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+11 B)	38.2 kB (+9 B)	34.4 kB (+16 B)
vue.global.prod.js	158 kB (+11 B)	58.3 kB (+7 B)	51.9 kB (-3 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	46.4 kB	18.1 kB	16.6 kB
createApp	54.4 kB	21.2 kB	19.4 kB
createSSRApp	58.6 kB	22.9 kB	20.9 kB
defineCustomElement	59.2 kB	22.7 kB	20.7 kB
overall	68.5 kB	26.3 kB	24 kB

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@vue/compat

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commit: bc24456

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
quasar	✅ success	✅ success
nuxt	✅ success	✅ success
language-tools	✅ success	✅ success
radix-vue	✅ success	✅ success
primevue	✅ success	✅ success
pinia	✅ success	✅ success
router	✅ success	✅ success
test-utils	✅ success	✅ success
vitepress	✅ success	✅ success
vant	✅ success	✅ success
vueuse	✅ success	✅ success
vite-plugin-vue	✅ success	✅ success
vue-macros	✅ success	✅ success
vue-i18n	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success
vuetify	✅ success	✅ success