fix(injectScript): wait for the script to load

[JianJroh]

Case

// content.ts
export default defineContentScript({
  async main() {
    await injectScript('/injected.js')
    console.log('content script started')
  },
})
// injected.ts
export default defineUnlistedScript({
  main() {
    console.log('injected script started')
  },
})

Result

Before change

content script started
injected script started

After change

injected script started
content script started

Ensure that the code runs in the expected order.

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