Closes #63109 for Service Map by resetting edges styles for the selected node (#63655) (#63661)

Author: ogupte

x-pack/legacy/plugins/apm/public/components/app/ServiceMap/Cytoscape.tsx

@@ -211,7 +211,9 @@ export function Cytoscape({
       resetConnectedEdgeStyle(event.target);
     };
     const unselectHandler: cytoscape.EventHandler = event => {
-      resetConnectedEdgeStyle();
+      resetConnectedEdgeStyle(
+        serviceName ? event.cy.getElementById(serviceName) : undefined
+      );
     };
     const debugHandler: cytoscape.EventHandler = event => {
       const debugEnabled = sessionStorage.getItem('apm_debug') === 'true';