[wpilibj] Crash robot program if an exception occurs during opmode construction (#8982)

There's essentially nothing the user can do here, other then switch
opmodes. It will make it clearer that something is very wrong.

wpilibj/src/main/java/org/wpilib/framework/OpModeRobot.java

@@ -118,9 +118,8 @@ public abstract class OpModeRobot extends RobotBase {
     try {
       return constructor.get().newInstance(this);
     } catch (ReflectiveOperationException e) {
-      DriverStationErrors.reportError(
-          "Could not instantiate OpMode " + cls.getSimpleName(), e.getStackTrace());
-      return null;
+      throw new RuntimeException(
+          "Could not instantiate OpMode " + cls.getSimpleName(), e.getCause());
     }
   }