Add `Scheduled` as retry status

[keisku]

What does this PR do?

Add new Scheduled status in pkg/util/retry.

Motivation

After adding this status, I will use it as below to suppress same debug logs.

git diff | cat
diff --git a/pkg/util/containers/cri/util.go b/pkg/util/containers/cri/util.go
index 5c4fb37697..ab49b6f1e0 100644
--- a/pkg/util/containers/cri/util.go
+++ b/pkg/util/containers/cri/util.go
@@ -126,7 +126,11 @@ func GetUtil() (*CRIUtil, error) {
 	})

 	if err := globalCRIUtil.initRetry.TriggerRetry(); err != nil {
-		log.Debugf("CRI init error: %s", err)
+		if retry.IsScheduled(err) {
+			log.Trace("CLI init scheduled")
+		} else {
+			log.Debugf("CRI init error: %s", err)
+		}
 		return nil, err
 	}
 	return globalCRIUtil, nil

In my environment, there are more than 400 debug logs like below in last 15 minutes.

CRI init error: temporary failure in criutil, will retry later: try delay not elapsed yet

Additional Notes

Possible Drawbacks / Trade-offs

Describe how to test/QA your changes

The status and functions added in this PR are intended to be used in subsequent PRs, so there will be no change in the Agent’s behavior.