Remove checking for error from session end in web terminal (#8797) (#…

…8816)

Removes the call for wait for ssh.Session end to check for errors
in web terminal which fixes a regression bug where typing "exit" 
in web terminal does not return session end event. 
PR #8081 removed the need to check for errors as it correctly 
returns exit errors whereas before it returned nil.

lib/web/terminal.go

@@ -494,16 +494,6 @@ func (t *TerminalHandler) streamTerminal(ws *websocket.Conn, tc *client.Teleport
 		return
 	}
 
-	// Check if remote process exited with error code, eg: RemoteCommandFailure (255).
-	if t.sshSession != nil {
-		if err := t.sshSession.Wait(); err != nil {
-			if exitErr, ok := err.(*ssh.ExitError); ok {
-				t.log.Warnf("Remote shell exited with error code: %v", exitErr.ExitStatus())
-				return
-			}
-		}
-	}
-
 	// Send close envelope to web terminal upon exit without an error.
 	envelope := &Envelope{
 		Version: defaults.WebsocketVersion,