[CONTINT-5217][CONTINT-5218][CONTINT-5219][CONTINT-5220] Remove IncludePreviousSample to preserve one-shot stats behavior

Drop IncludePreviousSample from ContainerStats call. This option makes
the daemon collect two samples one second apart before returning, adding
~1s latency per container during metric collection. Since the codebase
never uses PreCPUStats/PreRead, this delay was unnecessary. Using the
zero-value options preserves the original ContainerStatsOneShot behavior.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: L3n41c

pkg/util/docker/docker_util.go

@@ -382,7 +382,7 @@ func (d *DockerUtil) AllContainerLabels(ctx context.Context) (map[string]map[str
 func (d *DockerUtil) GetContainerStats(ctx context.Context, containerID string) (*dcontainer.StatsResponse, error) {
 	ctx, cancel := context.WithTimeout(ctx, d.queryTimeout)
 	defer cancel()
-	stats, err := d.cli.ContainerStats(ctx, containerID, client.ContainerStatsOptions{IncludePreviousSample: true})
+	stats, err := d.cli.ContainerStats(ctx, containerID, client.ContainerStatsOptions{})
 	if err != nil {
 		return nil, fmt.Errorf("unable to get Docker stats: %s", err)
 	}