fix: improve tests and remove unused code

- Corrected XML test data to remove unnecessary `<descr>` tags, resolving failing tests.
- Removed the unused `ratatui_utils` module and its associated code.
- Simplified example in `harmony_tui/src/lib.rs` to use `tokio::main` and register scores directly with `Maestro`. This aligns with the project's evolving structure.

examples/tui/src/main.rs

@@ -1,10 +1,7 @@
 use harmony::{
     inventory::Inventory,
     maestro::Maestro,
-    modules::{
-        dummy::{ErrorScore, PanicScore, SuccessScore},
-        k8s::deployment::K8sDeploymentScore,
-    },
+    modules::dummy::{ErrorScore, PanicScore, SuccessScore},
     topology::HAClusterTopology,
 };