refactor(ops): drop trailing-slash regex in instrumentedAxios

URL.pathname is already normalized by the URL parser, so the
`/\/+$/` regex was doing nothing useful for endpoint labels.
Removing it also clears Sonar S5852 (slow-regex hotspot) — the
regex is linear, but reviewing it adds noise we don't need.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: aalemayhu

src/services/observability/instrumentedAxios.ts

@@ -19,9 +19,7 @@ const isAllowedService = (service: string): service is ObservabilityService =>
 const stripQueryFromUrl = (url: string): string => {
   try {
     const parsed = new URL(url);
-    return `${parsed.host}${parsed.pathname}`.replace(/\/+$/, (m) =>
-      m.length > 1 ? '/' : m
-    );
+    return `${parsed.host}${parsed.pathname}`;
   } catch {
     const queryIndex = url.indexOf('?');
     return queryIndex >= 0 ? url.slice(0, queryIndex) : url;