fix(runtime-core): support for nested calls to runWithContext

[yangxiuxiu1115]

fix #10260

[github-actions]

Size Report

Bundles

File	Size	Gzip	Brotli
runtime-dom.global.prod.js	90.2 kB (+8 B)	34.4 kB (+6 B)	30.9 kB (+5 B)
vue.global.prod.js	147 kB (+8 B)	53.6 kB (+6 B)	47.9 kB (+112 B)

Usages

Name	Size	Gzip	Brotli
createApp	50.4 kB (+8 B)	19.7 kB (+2 B)	18 kB (+1 B)
createSSRApp	53.7 kB (+8 B)	21 kB (+3 B)	19.2 kB (+53 B)
defineCustomElement	52.6 kB (+8 B)	20.4 kB (+2 B)	18.6 kB (+11 B)
overall	64.1 kB (+8 B)	24.8 kB (+4 B)	22.5 kB (+6 B)

[so1ve]

What if user does:

app.runWithContext(() => {
  app.runWithContext(() => {
    app.runWithContext(() => {
    })
    inject('foo')
  })
  return inject('foo')
})

I think you should use a stack

[yangxiuxiu1115]

I tested this case locally and it passed.

[yyx990803]

@so1ve lastApp is saved in the closures in a call stack :)