batch: Set a default retry attempts and a prefix (#20452)

A batch job will fail if the retry attempt is not provided. The reason
is that the code mistakenly gets the retry attempts from the job status
rather than the job yaml file.

This will also set a default empty prefix for batch expiration.

Also this will avoid trimming the prefix since the yaml decoder already
does that if no quotes were provided, and we should not trim if quotes
were provided and the user provided a leading or a trailing space.

cmd/batch-rotate.go

@@ -267,8 +267,12 @@ func (r *BatchJobKeyRotateV1) Start(ctx context.Context, api ObjectLayer, job Ba
 	globalBatchJobsMetrics.save(job.ID, ri)
 	lastObject := ri.Object
 
+	retryAttempts := job.KeyRotate.Flags.Retry.Attempts
+	if retryAttempts <= 0 {
+		retryAttempts = batchKeyRotateJobDefaultRetries
+	}
 	delay := job.KeyRotate.Flags.Retry.Delay
-	if delay == 0 {
+	if delay <= 0 {
 		delay = batchKeyRotateJobDefaultRetryDelay
 	}
 
@@ -354,7 +358,6 @@ func (r *BatchJobKeyRotateV1) Start(ctx context.Context, api ObjectLayer, job Ba
 		return err
 	}
 
-	retryAttempts := ri.RetryAttempts
 	ctx, cancel := context.WithCancel(ctx)
 
 	results := make(chan itemOrErr[ObjectInfo], 100)