[Tests] Fix racy condition in MembershipAgentTests (#9816)

Fix racy condition in MembershipAgentTests

Author: ReubenBond

test/NonSilo.Tests/Membership/MembershipAgentTests.cs

@@ -280,7 +280,7 @@ public async Task MembershipAgent_LifecycleStages_ValidateInitialConnectivity_Su
                 this.localSiloDetails);
             var started = this.lifecycle.OnStart();
 
-            await Until(() => remoteSiloProber.ReceivedCalls().Count() < otherSilos.Length);
+            await Until(() => remoteSiloProber.ReceivedCalls().Count() >= otherSilos.Length);
 
 
             await Until(() => started.IsCompleted);
@@ -333,7 +333,7 @@ public async Task MembershipAgent_LifecycleStages_ValidateInitialConnectivity_Fa
                 this.localSiloDetails);
             var started = this.lifecycle.OnStart();
 
-            await Until(() => this.remoteSiloProber.ReceivedCalls().Count() < otherSilos.Length);
+            await Until(() => this.remoteSiloProber.ReceivedCalls().Count() >= otherSilos.Length);
             await Until(() => started.IsCompleted);
 
             // Startup should have faulted.