[halsim_gui, wpilibc/j] Fixups for joystick outputs (#8443)

#8385 changed gamepad types to follow SDL_GamepadType, so 20 and 21
(previously `kHIDJoystick` and `kHIDGamepad`, respectively) are no
longer valid constants. This meant that after leaving the disconnected
state of the sim GUI, `GamepadType.getGamepadType()` would return null
(since it didn't match any constants). Since there aren't analogous
generic joystick and gamepad constants anymore, this PR changes
GlfwSystemJoystick and KeyboardJoystick to both unconditionally report
as kStandard.

This also updates the GenericHID.SetRumble doc comment to reflect the
two new types of rumble and changes some switch labeled statement groups
to use switch rules instead. If we want to keep on using switch labeled
statement groups (e.g. for consistency with C++, though
GenericHID::SetRumble currently uses if-else), then I could drop the
last change- I just made it since GenericHID.setRumble() previously used
switch rules and general switch rules are nice since there's no risk of
fall-through.

wpilibj/src/main/java/org/wpilib/simulation/GenericHIDSim.java

@@ -171,23 +171,13 @@ public class GenericHIDSim {
    * @return the rumble value
    */
   public double getRumble(GenericHID.RumbleType type) {
-    int intType = 0;
-    switch (type) {
-      case kLeftRumble:
-        intType = 0;
-        break;
-      case kRightRumble:
-        intType = 1;
-        break;
-      case kLeftTriggerRumble:
-        intType = 2;
-        break;
-      case kRightTriggerRumble:
-        intType = 3;
-        break;
-      default:
-        return 0.0;
-    }
+    int intType =
+        switch (type) {
+          case kLeftRumble -> 0;
+          case kRightRumble -> 1;
+          case kLeftTriggerRumble -> 2;
+          case kRightTriggerRumble -> 3;
+        };
     int value = DriverStationSim.getJoystickRumble(m_port, intType);
     return value / 65535.0;
   }