Controls the mode of DNS-over-HTTPS

Controls the mode of the DNS-over-HTTPS resolver. Please note that this
policy will only set the default mode for each query. The mode may be
overridden for special types of queries such as requests to resolve a
DNS-over-HTTPS server hostname.

The "off" mode will disable
DNS-over-HTTPS.

The "automatic" mode will send
DNS-over-HTTPS queries first if a DNS-over-HTTPS server is available and
may fallback to sending insecure queries on error.

The "secure" mode will only send
DNS-over-HTTPS queries and will fail to resolve on error.

On Android Pie and above, if DNS-over-TLS
is active, Google Chrome will not
send insecure DNS requests.

If this policy is unset, for managed devices DNS-over-HTTPS queries will not
be sent. Otherwise, the browser may send DNS-over-HTTPS requests to a
resolver associated with the user's configured system resolver.

Example value: off