oracleobjectstorage: speed up operations by using S3 pacer and setting minsleep to 10ms

Uploading 100 files of each 1 MB took 20 seconds before. With above fix it takes around 2 seconds now.

10x time improvement in line with pacer's sleep reduction from 100ms to 10ms

backend/oracleobjectstorage/options.go

@@ -17,9 +17,7 @@ const (
 	defaultUploadCutoff        = fs.SizeSuffix(200 * 1024 * 1024)
 	defaultUploadConcurrency   = 10
 	maxUploadCutoff            = fs.SizeSuffix(5 * 1024 * 1024 * 1024)
-	minSleep                   = 100 * time.Millisecond
-	maxSleep                   = 5 * time.Minute
-	decayConstant              = 1 // bigger for slower decay, exponential
+	minSleep                   = 10 * time.Millisecond
 	defaultCopyTimeoutDuration = fs.Duration(time.Minute)
 )