[wpiutil] Remove Protobuf.getNested() (#6812)

It was superseded by using FileDescriptor.getDependencies().

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Ellipse2dProto.java

@@ -21,11 +21,6 @@ public class Ellipse2dProto implements Protobuf<Ellipse2d, ProtobufEllipse2d> {
     return ProtobufEllipse2d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Pose2d.proto};
-  }
-
   @Override
   public ProtobufEllipse2d createMessage() {
     return ProtobufEllipse2d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Pose2dProto.java

@@ -22,11 +22,6 @@ public class Pose2dProto implements Protobuf<Pose2d, ProtobufPose2d> {
     return ProtobufPose2d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Translation2d.proto, Rotation2d.proto};
-  }
-
   @Override
   public ProtobufPose2d createMessage() {
     return ProtobufPose2d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Pose3dProto.java

@@ -22,11 +22,6 @@ public class Pose3dProto implements Protobuf<Pose3d, ProtobufPose3d> {
     return ProtobufPose3d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Translation3d.proto, Rotation3d.proto};
-  }
-
   @Override
   public ProtobufPose3d createMessage() {
     return ProtobufPose3d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Rectangle2dProto.java

@@ -21,11 +21,6 @@ public class Rectangle2dProto implements Protobuf<Rectangle2d, ProtobufRectangle
     return ProtobufRectangle2d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Pose2d.proto};
-  }
-
   @Override
   public ProtobufRectangle2d createMessage() {
     return ProtobufRectangle2d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Rotation3dProto.java

@@ -21,11 +21,6 @@ public class Rotation3dProto implements Protobuf<Rotation3d, ProtobufRotation3d>
     return ProtobufRotation3d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Quaternion.proto};
-  }
-
   @Override
   public ProtobufRotation3d createMessage() {
     return ProtobufRotation3d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Transform2dProto.java

@@ -22,11 +22,6 @@ public class Transform2dProto implements Protobuf<Transform2d, ProtobufTransform
     return ProtobufTransform2d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Translation2d.proto, Rotation2d.proto};
-  }
-
   @Override
   public ProtobufTransform2d createMessage() {
     return ProtobufTransform2d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/geometry/proto/Transform3dProto.java

@@ -22,11 +22,6 @@ public class Transform3dProto implements Protobuf<Transform3d, ProtobufTransform
     return ProtobufTransform3d.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Translation3d.proto, Rotation3d.proto};
-  }
-
   @Override
   public ProtobufTransform3d createMessage() {
     return ProtobufTransform3d.newInstance();

wpimath/src/main/java/edu/wpi/first/math/kinematics/proto/MecanumDriveKinematicsProto.java

@@ -22,11 +22,6 @@ public class MecanumDriveKinematicsProto
     return ProtobufMecanumDriveKinematics.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Translation2d.proto};
-  }
-
   @Override
   public ProtobufMecanumDriveKinematics createMessage() {
     return ProtobufMecanumDriveKinematics.newInstance();

wpimath/src/main/java/edu/wpi/first/math/kinematics/proto/SwerveModulePositionProto.java

@@ -22,11 +22,6 @@ public class SwerveModulePositionProto
     return ProtobufSwerveModulePosition.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Rotation2d.proto};
-  }
-
   @Override
   public ProtobufSwerveModulePosition createMessage() {
     return ProtobufSwerveModulePosition.newInstance();

wpimath/src/main/java/edu/wpi/first/math/kinematics/proto/SwerveModuleStateProto.java

@@ -22,11 +22,6 @@ public class SwerveModuleStateProto
     return ProtobufSwerveModuleState.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Rotation2d.proto};
-  }
-
   @Override
   public ProtobufSwerveModuleState createMessage() {
     return ProtobufSwerveModuleState.newInstance();

wpimath/src/main/java/edu/wpi/first/math/trajectory/proto/TrajectoryProto.java

@@ -22,11 +22,6 @@ public class TrajectoryProto implements Protobuf<Trajectory, ProtobufTrajectory>
     return ProtobufTrajectory.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Trajectory.State.proto};
-  }
-
   @Override
   public ProtobufTrajectory createMessage() {
     return ProtobufTrajectory.newInstance();

wpimath/src/main/java/edu/wpi/first/math/trajectory/proto/TrajectoryStateProto.java

@@ -21,11 +21,6 @@ public class TrajectoryStateProto implements Protobuf<Trajectory.State, Protobuf
     return ProtobufTrajectoryState.getDescriptor();
   }
 
-  @Override
-  public Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {Pose2d.proto};
-  }
-
   @Override
   public ProtobufTrajectoryState createMessage() {
     return ProtobufTrajectoryState.newInstance();

wpiutil/src/main/java/edu/wpi/first/util/protobuf/Protobuf.java

@@ -48,15 +48,6 @@ public interface Protobuf<T, MessageType extends ProtoMessage<?>> {
    */
   Descriptor getDescriptor();
 
-  /**
-   * Gets the list of protobuf types referenced by this protobuf.
-   *
-   * @return list of protobuf types
-   */
-  default Protobuf<?, ?>[] getNested() {
-    return new Protobuf<?, ?>[] {};
-  }
-
   /**
    * Creates protobuf message.
    *