Fix code scanning alert no. 456: Incomplete string escaping or encoding

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

x-pack/plugins/observability_solution/infra/public/pages/metrics/metrics_explorer/components/helpers/create_tsvb_link.ts

@@ -125,7 +125,7 @@ export const createFilterFromOptions = (
             if (!value) {
               return null;
             }
-            return `${field}: "${value.replace(/"/g, '\\"')}"`;
+            return `${field}: "${value.replace(/\\/g, '\\\\').replace(/"/g, '\\"')}"`;
           })
           .join(' and ')
       : `${options.groupBy} : "${id}"`;