Tests that Emulation.setLocaleOverride works when sent to a dedicated worker target.

Set locale to zh_CN in dedicated worker
Detected main page locale: zh-CN
Detected dedicated worker locale: zh-CN

Tried to set override from main page
Another locale override is already in effect

Overwrite locale with fr-FR in dedicated worker
Detected main page locale: fr-FR
Detected dedicated worker locale: fr-FR

Reset locale to default in dedicated worker
Locale correctly reset to initial value: true

Set locale to ru-RU in main page after dedicated worker reset
Detected main page locale: ru-RU
Detected dedicated worker locale: ru-RU