[wpilibj] Fix warnings that are not unused variables or deprecation (#3161)

Fix all warnings given by intellisense that are not unused variables or deprecation.

wpilibj/src/test/java/edu/wpi/first/wpilibj/simulation/ElevatorSimTest.java

@@ -19,7 +19,7 @@ import org.junit.jupiter.api.Test;
 
 public class ElevatorSimTest {
   @Test
-  @SuppressWarnings("LocalVariableName")
+  @SuppressWarnings({"LocalVariableName", "resource"})
   public void testStateSpaceSimWithElevator() {
 
     var controller = new PIDController(10, 0, 0);