fix(Transition): handle leave immediately done in out-in mode

[edison1105]

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This is an edge case. It occurs because done is executed immediately in onLeave, causing afterLeave to execute immediately, while emptyPlaceholder hasn't yet been mounted.

While reviewing #4941, I found that #4933 could no longer be reproduced, so I closed them. However, the second issue described in #11061 was previously marked as a duplicate of #4941. #4933 does indeed fix it, but the test cases are not the same. Therefore, I created this new PR.

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+2 B)	37.7 kB (+2 B)	34 kB (-28 B)
vue.global.prod.js	159 kB (+2 B)	57.6 kB (+5 B)	51.2 kB (+27 B)

Usages

Name	Size	Gzip	Brotli
createApp	55.2 kB	21.2 kB	19.4 kB
createSSRApp	59.2 kB	22.9 kB	20.9 kB
defineCustomElement	60 kB	22.8 kB	20.8 kB
overall	69 kB (+2 B)	26.3 kB (+2 B)	23.9 kB (-25 B)

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commit: 43d5e4d

[yyx990803]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

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