Allow only company domain accounts

Prevents users from being able to share their session with any guests who are not part of their company or any other company that has been given access. Users must be logged in with their company email to access Live Share. If this policy is disabled, any user from any organization can access a shared Live Share session. Use ; to separate out multiple domains. For example, set the domain name as contoso.com or contoso.com;foo.com For more information, see: https://aka.ms/vsls-policies