Fix the vacuum log message in DRY RUN

Currently, we output a log line with `DeltaVacuumStats` like this
```
Found 12 files and directories in a total of 1 directories that are safe to delete.DeltaVacuumStats(true,Some(0),604800000,1669825818524,1,12,10404,11374,0)
```

This change fixes it in a better format:
```
Found 12 files (10404 bytes) and directories in a total of 1 directories that are safe to delete.
```

A simple log change.

GitOrigin-RevId: 182e7c094647f639e925d714f60f2b4dc8c32944

core/src/main/scala/org/apache/spark/sql/delta/commands/VacuumCommand.scala

@@ -241,8 +241,8 @@ object VacuumCommand extends VacuumCommandImpl with Serializable {
             timeTakenForDelete = 0L)
 
           recordDeltaEvent(deltaLog, "delta.gc.stats", data = stats)
-          logConsole(s"Found $numFiles files and directories in a total of " +
-            s"$dirCounts directories that are safe to delete.$stats")
+          logConsole(s"Found $numFiles files ($sizeOfDataToDelete bytes) and directories in " +
+            s"a total of $dirCounts directories that are safe to delete.")
 
           return diffFiles.map(f => stringToPath(f).toString).toDF("path")
         }