Merge pull request #62466 from aleksandra-malinowska/fix-parsing-timestamp

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Fix parsing timestamp in test

Go 1.9 changed the default string format, see golang/go#20876 

As discussed there, default format is intended to be readable for humans and can change without warning, so we should probably set the format explicitly when writing status configmap.

```release-note
NONE
```

Author: Kubernetes Submit Queue

test/e2e/autoscaling/cluster_size_autoscaling.go

@@ -1860,7 +1860,7 @@ type scaleUpStatus struct {
 // Try to get timestamp from status.
 // Status configmap is not parsing-friendly, so evil regexpery follows.
 func getStatusTimestamp(status string) (time.Time, error) {
-	timestampMatcher, err := regexp.Compile("Cluster-autoscaler status at \\s*([0-9\\-]+ [0-9]+:[0-9]+:[0-9]+\\.[0-9]+ \\+[0-9]+ [A-Za-z]+):")
+	timestampMatcher, err := regexp.Compile("Cluster-autoscaler status at \\s*([0-9\\-]+ [0-9]+:[0-9]+:[0-9]+\\.[0-9]+ \\+[0-9]+ [A-Za-z]+)")
 	if err != nil {
 		return time.Time{}, err
 	}