Fix: remove unnecessary case in field selector (#5367)

Signed-off-by: wuzhongjian <wuzhongjian_yewu@cmss.chinamobile.com>

Signed-off-by: wuzhongjian <wuzhongjian_yewu@cmss.chinamobile.com>

pkg/models/resources/v1alpha3/secret/secrets.go

@@ -100,10 +100,11 @@ func contains(secret *v1.Secret, queryValue query.Value) bool {
 	for _, requirement := range fieldSelector.Requirements() {
 		var negative bool
 		// supports '=', '==' and '!='.(e.g. ?fieldSelector=key1=value1,key2=value2)
+		// fields.ParseSelector(FieldSelector) has handled the case where the operator is '==' and converted it to '=',
+		// so case selection.DoubleEquals can be ignored here.
 		switch requirement.Operator {
 		case selection.NotEquals:
 			negative = true
-		case selection.DoubleEquals:
 		case selection.Equals:
 			negative = false
 		}