Update internal execution fixtures for identified resources

internal/usecase/smoke_tester_test.go

@@ -19,7 +19,7 @@ import (
 
 func TestSmokeTesterAssemblesReachabilityReportWithoutGenerationAdmission(t *testing.T) {
 	values := smokeSelectionConfig()
-	alpha := values["backends"].(map[string]any)["alpha"].(map[string]any)
+	alpha := smokeSelectionBackend(values, "alpha")
 	alphaSmoke := alpha["smoke_tests"].(map[string]any)
 	alphaReachability := alphaSmoke["reachability"].(map[string]any)
 	alphaReachability["endpoint"] = "https://operator:private@example.invalid/health?check=1"
@@ -166,7 +166,7 @@ func TestSmokeTesterReportsUnsupportedAndInapplicableAuthentication(t *testing.T
 		t.Run(tc.name, func(t *testing.T) {
 			values := smokeSelectionConfig()
 			if tc.configureNone {
-				backend := values["backends"].(map[string]any)[tc.backend].(map[string]any)
+				backend := smokeSelectionBackend(values, tc.backend)
 				backend["smoke_tests"].(map[string]any)["authentication"] = map[string]any{"kind": "none"}
 			}
 			runner := smokeTesterRunner(t, values)