cloudv2: Downscale the batch size

The backend has the limit set to 1k so it doesn't make sense to use a
bigger value forcing the system to split a single batch in multiple
jobs.

cloudapi/config.go

@@ -175,7 +175,7 @@ func NewConfig() Config {
 		TracesPushConcurrency: null.NewInt(1, false),
 
 		MaxMetricSamplesPerPackage: null.NewInt(100000, false),
-		MaxTimeSeriesInBatch:       null.NewInt(10000, false),
+		MaxTimeSeriesInBatch:       null.NewInt(1000, false),
 		Timeout:                    types.NewNullDuration(1*time.Minute, false),
 		APIVersion:                 null.NewInt(1, false),
 		// Aggregation is disabled by default, since AggregationPeriod has no default value