Quick bug fix: PPAF (Azure#35192)

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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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Author: ujjwalsoni1707

sdk/cosmosdb/cosmos/src/request/RequestHandler.ts

@@ -57,6 +57,7 @@ async function httpRequest(
     }
   }
 
+  let requestTimeout = requestContext.connectionPolicy.requestTimeout;
   // If the request is a read request and partition level failover or circuit breaker is enabled,
   // set a shorter timeout to allow for quicker failover in case of partition unavailability.
   // This is to ensure that read requests can quickly failover to another partition if the current one is unavailable.
@@ -67,14 +68,14 @@ async function httpRequest(
     requestContext.resourceType === ResourceType.item &&
     isReadRequest(requestContext.operationType)
   ) {
-    requestContext.connectionPolicy.requestTimeout = Math.min(
+    requestTimeout = Math.min(
       requestContext.connectionPolicy.requestTimeout,
       Constants.RequestTimeoutForReadsInMs,
     );
   }
   const timeout = setTimeout(() => {
     controller.abort();
-  }, requestContext.connectionPolicy.requestTimeout);
+  }, requestTimeout);
 
   let response: PipelineResponse;