Merged PR 803931: Ensure the cancellationToken is not passed to GarbageCollector.

Correct the condition to Ensure the cancellationToken is not passed to GarbageCollector.

Related work items: #2211574

Public/Src/Engine/Scheduler/Caching/HistoricMetadataCache.cs

@@ -480,7 +480,7 @@ namespace BuildXL.Scheduler.Cache
                 {
                     // This flag ensures that garbage collection fully completes before proceeding,
                     // preventing issues caused by incomplete entry populations during cache operations.
-                    if (m_waitForGCOnClose)
+                    if (!m_waitForGCOnClose)
                     {
                         // Stop garbage collection
                         await m_garbageCollectCancellation.CancelTokenAsyncIfSupported();