Fix MultipleLogManagersTests: atomic counter and relaxed timeouts

- Make RequestHandler::m_count atomic to fix data race between server
  thread (writing) and test thread (reading).
- Increase wait timeouts from 10s to 20s to accommodate slow CI
  simulators where NSURLSession connection setup can be delayed.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bmehta001

tests/functests/MultipleLogManagersTests.cpp

@@ -54,7 +54,7 @@ class RequestHandler : public HttpServer::Callback
     }
 
    private:
-    size_t m_count {};
+    std::atomic<size_t> m_count {};
     int m_id ;
 };
 
@@ -196,7 +196,7 @@ TEST_F(MultipleLogManagersTests, ThreeInstancesCoexist)
     lm2->GetLogController()->UploadNow();
     lm3->GetLogController()->UploadNow();
 
-    waitForRequestsMultipleLogManager(10000, 1, 1, 1);
+    waitForRequestsMultipleLogManager(20000, 1, 1, 1);
 
     lm1.reset();
     lm2.reset();
@@ -224,7 +224,7 @@ TEST_F(MultipleLogManagersTests, MultiProcessesLogManager)
     CAPTURE_PERF_STATS("Events Sent");
     lm->GetLogController()->UploadNow();
     CAPTURE_PERF_STATS("Events Uploaded");
-    waitForRequestsSingleLogManager(10000, 2);
+    waitForRequestsSingleLogManager(20000, 2);
     lm.reset();
     CAPTURE_PERF_STATS("Log Manager deleted");
 }