ci: enable gocognit (#9359)

And, bring the server under 300:

* Removed the undocumented "disable" STUN address in favor of the
--disable-direct flag.

coderd/coderd.go

@@ -184,8 +184,6 @@ type Options struct {
 // @in header
 // @name Coder-Session-Token
 // New constructs a Coder API handler.
-//
-//nolint:gocyclo
 func New(options *Options) *API {
 	if options == nil {
 		options = &Options{}