Merge pull request #1904 from tyrielv/tyrielv/prefetch-telemetry

Add last timestamp to TryDownloadPrefetchPacks success telemetry

Author: tyrielv

GVFS/GVFS.Common/Git/GitObjects.cs

@@ -210,6 +210,7 @@ public virtual bool TryDownloadPrefetchPacks(GitProcess gitProcess, long latestT
                         { "Success", result.Succeeded },
                         { "Attempts", result.Attempts },
                         { "BytesDownloaded", bytesDownloaded },
+                        { "LatestPrefetchPackTimestamp", latestTimestamp },
                     });
 
                 return result.Succeeded;