TUN-8423: Deprecate older legacy tunnel capnp interfaces

Since legacy tunnels have been removed for a while now, we can remove
many of the capnp rpc interfaces that are no longer leveraged by the
legacy tunnel registration and authentication mechanisms.

tunnelrpc/pogs/cloudflared_server.go

@@ -0,0 +1,54 @@
+package pogs
+
+import (
+	capnp "zombiezen.com/go/capnproto2"
+	"zombiezen.com/go/capnproto2/rpc"
+
+	"github.com/cloudflare/cloudflared/tunnelrpc/proto"
+)
+
+type CloudflaredServer interface {
+	SessionManager
+	ConfigurationManager
+}
+
+type CloudflaredServer_PogsImpl struct {
+	SessionManager_PogsImpl
+	ConfigurationManager_PogsImpl
+}
+
+func CloudflaredServer_ServerToClient(s SessionManager, c ConfigurationManager) proto.CloudflaredServer {
+	return proto.CloudflaredServer_ServerToClient(CloudflaredServer_PogsImpl{
+		SessionManager_PogsImpl:       SessionManager_PogsImpl{s},
+		ConfigurationManager_PogsImpl: ConfigurationManager_PogsImpl{c},
+	})
+}
+
+type CloudflaredServer_PogsClient struct {
+	SessionManager_PogsClient
+	ConfigurationManager_PogsClient
+	Client capnp.Client
+	Conn   *rpc.Conn
+}
+
+func NewCloudflaredServer_PogsClient(client capnp.Client, conn *rpc.Conn) CloudflaredServer_PogsClient {
+	sessionManagerClient := SessionManager_PogsClient{
+		Client: client,
+		Conn:   conn,
+	}
+	configManagerClient := ConfigurationManager_PogsClient{
+		Client: client,
+		Conn:   conn,
+	}
+	return CloudflaredServer_PogsClient{
+		SessionManager_PogsClient:       sessionManagerClient,
+		ConfigurationManager_PogsClient: configManagerClient,
+		Client:                          client,
+		Conn:                            conn,
+	}
+}
+
+func (c CloudflaredServer_PogsClient) Close() error {
+	c.Client.Close()
+	return c.Conn.Close()
+}