fix(runtime-core): use separate emits caches for components and mixins

[gcaaa31928]

This seems to be the same issue as #11350, except that in this case, the emits cache is being reused by both mixins and components, which could lead to the emit validation being applied in the wrong context.

However, the fix here is the same: separate the emits cache from the appContext

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	100 kB (+39 B)	37.7 kB (+20 B)	34 kB (+55 B)
vue.global.prod.js	159 kB (+39 B)	57.6 kB (+12 B)	51.2 kB (-91 B)

Usages

Name	Size	Gzip	Brotli
createApp (CAPI only)	48.8 kB	18.8 kB	17.2 kB
createApp	55.3 kB (+39 B)	21.2 kB (+6 B)	19.4 kB (-27 B)
createSSRApp	59.3 kB (+39 B)	22.9 kB (+3 B)	20.9 kB (+1 B)
defineCustomElement	60.1 kB (+39 B)	22.8 kB (+8 B)	20.7 kB
overall	69.1 kB (+39 B)	26.3 kB (+3 B)	24 kB (+70 B)

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vue

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commit: 01bc263

[edison1105]

/ecosystem-ci run

[vue-bot]

📝 Ran ecosystem CI: Open

suite	result	latest scheduled
language-tools	❌ failure	❌ failure
nuxt	✅ success	✅ success
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	✅ success	✅ success
vue-macros	✅ success	✅ success
vuetify	✅ success	✅ success
vueuse	✅ success	✅ success
vue-simple-compiler	✅ success	✅ success