Use new frp auth plugin, move to ns 'default'
Fixes https://dev.hsrn.nyu.edu/hsrn-projects/infrastructure/-/issues/307
We are using frp for a lot of things, across different servers. Having a single token for frpc clients and no auth on the HTTP proxies is no longer ok.
This new frp instance has individual tokens for frpc clients and individual HTTP basic auth on proxies.
It is running at frp.hsrn.nyu.edu
, so we can move proxies individually until we are ready to remove monitoring-frp.hsrn.nyu.edu
.