[commands] Refactor ProxyScheduleCommand, SelectCommand into ProxyCommand (#4534)

wpilibNewCommands/src/main/native/include/frc2/command/ProxyScheduleCommand.h

@@ -8,6 +8,7 @@
 #include <span>
 
 #include <wpi/SmallVector.h>
+#include <wpi/deprecated.h>
 
 #include "frc2/command/CommandBase.h"
 #include "frc2/command/CommandHelper.h"
@@ -30,22 +31,14 @@ class ProxyScheduleCommand
    * initialized, and ends when they are all no longer scheduled.
    *
    * @param toSchedule the commands to schedule
+   * @deprecated Replace with {@link ProxyCommand},
+   * composing multiple of them in a {@link ParallelRaceGroup} if needed.
    */
+  WPI_DEPRECATED("Replace with ProxyCommand")
   explicit ProxyScheduleCommand(std::span<Command* const> toSchedule);
 
   explicit ProxyScheduleCommand(Command* toSchedule);
 
-  /**
-   * Creates a new ProxyScheduleCommand that schedules the given command when
-   * initialized, and ends when it is no longer scheduled.
-   *
-   * <p>Note that this constructor passes ownership of the given command to the
-   * returned ProxyScheduleCommand.
-   *
-   * @param toSchedule the command to schedule
-   */
-  explicit ProxyScheduleCommand(std::unique_ptr<Command>&& toSchedule);
-
   ProxyScheduleCommand(ProxyScheduleCommand&& other) = default;
 
   void Initialize() override;