Martin Brennan d6bd4ad7ee
FIX: Make can_send_private_messages not reliant on system user (#18812)
Since the system user is a regular user, it can have its
`allow_private_messages` user option turned off, which
with our current `can_send_private_message?(Discourse.system_user)`
check inside the CurrentUserSerializer, will prevent any
user from sending messages in the UI if the system user is not
accepting PMs.

This commit adds a new `can_send_private_messages?` method to
the Guardian, which can be used in serializers and not depend
on the system user. When the user actually sends a message
we still rely on the old `can_send_private_message?(target)`
call to see if they are allowed to send the message to the target.
The new method is just to say they can "generally" send
private messages.
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