Add warning about reload on network change

We are soon removing the automatic refresh on network change behavior.
A warning has been added to ensure sites know about this upcoming
change.

Any site that calls `.enable` is advised to use a
`networkChanged` event handler to reload manually if they rely upon
that behavior. They are also advised to set the flag
`autoRefreshOnNetworkChange` to `false` to opt-out of the reload
behavior early.

This warning might be irritating for certain sites, as they might be
indifferent to whether or not the site reloads, and not eager to set a
flag to opt-in early just to silence the warning. However there was no
other obvious way to warning the right people about this change, as
any warning prior to an actual reload would only be seen by the few
people that set their browser console to preserve logs.

Relates to #3599

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