[hal,wpilib] Rename "Test" robot mode to "Utility" (#8782)

The "Utility" name better matches its intended generic use case and
avoids overloaded terminology with unit testing (e.g. the need to name
the opmode annotation `@TestOpMode`).

The driver station will also be updated to reflect this change.

wpilibj/src/main/java/org/wpilib/hardware/motor/MotorSafety.java

@@ -134,7 +134,7 @@ public abstract class MotorSafety {
       stopTime = m_stopTime;
     }
 
-    if (!enabled || RobotState.isDisabled() || RobotState.isTest()) {
+    if (!enabled || RobotState.isDisabled() || RobotState.isUtility()) {
       return;
     }