Remove legacy test rainbow track state

src/esp/app_track_drawer.cpp

@@ -53,8 +53,6 @@ track_core::TrackState to_core(app::track::TrackState state) {
 		return track_core::TrackState::stop;
 	case track_app_TrackState_RUN:
 		return track_core::TrackState::run;
-	case track_app_TrackState_TEST_RAINBOW_CONTINUOUS:
-		return track_core::TrackState::test_rainbow;
 	case track_app_TrackState_TEST_DISPLAY:
 		return track_core::TrackState::test_display;
 	}

src/esp/app_track_model.cpp

@@ -15,8 +15,6 @@ const char *to_str(TrackState status) {
 		return "STOP";
 	case track_app_TrackState_RUN:
 		return "RUN";
-	case track_app_TrackState_TEST_RAINBOW_CONTINUOUS:
-		return "TEST_RAINBOW_CONTINUOUS";
 	case track_app_TrackState_TEST_DISPLAY:
 		return "TEST_DISPLAY";
 	}

src/python/bindings.cpp

@@ -144,7 +144,6 @@ NB_MODULE(_core, m) {
     nb::enum_<track_core::TrackState>(m, "TrackState")
         .value("stop", track_core::TrackState::stop)
         .value("run", track_core::TrackState::run)
-        .value("test_rainbow", track_core::TrackState::test_rainbow)
         .value("test_display", track_core::TrackState::test_display);
 
     nb::class_<track_core::Color>(m, "Color")