Migrate ENABLE_CURSOR_HOVER_STATES to aconfig

- Keeping FeatureFlags.ENABLE_CURSOR_HOVER_STATES for local testing until aconfig is available in FlagFlipper
- Still reference ENABLE_CURSOR_HOVER_STATES in tests as aconfig still can't be mocked

Bug: 300054410
Test: manual
Change-Id: Id385e8ee32ccf8b920b9b7f9cc620af32def589f
diff --git a/aconfig/launcher.aconfig b/aconfig/launcher.aconfig
index 226d717..8f4bfe0 100644
--- a/aconfig/launcher.aconfig
+++ b/aconfig/launcher.aconfig
@@ -20,3 +20,10 @@
     description: "Enable a grid-only overview without a focused task."
     bug: "270397206"
 }
+
+flag {
+    name: "enable_cursor_hover_states"
+    namespace: "launcher"
+    description: "Enables cursor hover states for certain elements."
+    bug: "243191650"
+}