chore: add http debug support to pgcoord (#8795)

coderd/database/queries/tailnet.sql

@@ -59,11 +59,20 @@ SELECT *
 FROM tailnet_agents
 WHERE id = $1;
 
+-- name: GetAllTailnetAgents :many
+SELECT *
+FROM tailnet_agents;
+
 -- name: GetTailnetClientsForAgent :many
 SELECT *
 FROM tailnet_clients
 WHERE agent_id = $1;
 
+-- name: GetAllTailnetClients :many
+SELECT *
+FROM tailnet_clients
+ORDER BY agent_id;
+
 -- name: UpsertTailnetCoordinator :one
 INSERT INTO
 	tailnet_coordinators (