fix(wasm-utxo): update fixture directory path from 'tests' to 'test'

Update the path reference in fixtures_directory() function and move all
fixture files to the new location.

Issue: BTC-2652

Co-authored-by: llm-git <[email protected]>

Author: OttoAllmendinger

packages/wasm-utxo/cli/src/format/fixtures.rs

@@ -23,7 +23,7 @@ pub fn generate_tree_text_with_scheme(
 /// Returns the path to the fixture directory
 pub fn fixtures_directory() -> PathBuf {
     let project_dir = env::current_dir().expect("Failed to get current directory");
-    project_dir.join("tests").join("fixtures")
+    project_dir.join("test").join("fixtures")
 }
 
 /// Write tree output to a fixture file