Minor change in userAgentDetails() function (#32372)

### Packages impacted by this PR
@azure/cosmos

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there are more than one possible design, why was the one in this PR
chosen?


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### Checklists
- [ ] Added impacted package name to the issue description
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create an Issue in the
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sdk/cosmosdb/cosmos/src/common/platform.ts

@@ -16,13 +16,15 @@ export function getUserAgent(suffix?: string): string {
 
 // TODO: Standardize across other platforms from @azure/core-util
 function userAgentDetails(): string {
+  let userAgentDetail = "<environment undetectable>";
+
   if (globalThis.navigator && globalThis.navigator.userAgent) {
-    return globalThis.navigator.userAgent;
+    userAgentDetail = globalThis.navigator.userAgent;
   }
 
   if (globalThis.process && globalThis.process.version) {
-    return `Node.js/${process.version.slice(1)} (${process.platform}; ${process.arch})`;
+    userAgentDetail = `Node.js/${process.version.slice(1)} (${process.platform}; ${process.arch})`;
   }
 
-  return "<environment undetectable>";
+  return userAgentDetail;
 }