feat(cli): add trafficgen command for load testing (#7307)

This PR adds a scaletest workspace-traffic command for load testing. This opens a
ReconnectingPTY connection to each scaletest workspace (via coderd) and 
concurrently writes and reads random data to/from the PTY. Payloads are of the
form #${RANDOM_ALPHANUMERIC_STRING}, which essentially drops garbage
comments in the remote shell, and should not result in any commands being executed.

cli/root.go

@@ -87,11 +87,13 @@ func (r *RootCmd) Core() []*clibase.Cmd {
 
 		// Workspace Commands
 		r.configSSH(),
-		r.rename(),
-		r.ping(),
 		r.create(),
 		r.deleteWorkspace(),
 		r.list(),
+		r.parameters(),
+		r.ping(),
+		r.rename(),
+		r.scaletest(),
 		r.schedules(),
 		r.show(),
 		r.speedtest(),
@@ -100,13 +102,11 @@ func (r *RootCmd) Core() []*clibase.Cmd {
 		r.stop(),
 		r.update(),
 		r.restart(),
-		r.parameters(),
 
 		// Hidden
-		r.workspaceAgent(),
-		r.scaletest(),
 		r.gitssh(),
 		r.vscodeSSH(),
+		r.workspaceAgent(),
 	}
 }