Add timestamp to Actions (#2113)

* Add timestamp to Actions

Signed-off-by: Vasil Ilchev <Vasil.Ilchev@bosch.com>

* Add Timestamp to All Actions Feedback DDI/DMF

* After review

* Removed Action timestamp as we have timestamp in each ActionStatus so use that instead

* Unify to use everywhere System.currentTimeMillis()

* Add constructor w/o timestamp to DmfActionUpdateStatus

---------

Signed-off-by: Vasil Ilchev <Vasil.Ilchev@bosch.com>
Co-authored-by: vasilchev <vasil.ilchev@bosch.com>

hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/action/MgmtAction.java

@@ -131,4 +131,5 @@ public class MgmtAction extends MgmtBaseEntity {
     @JsonProperty
     @Schema(description = "If created by external system this field contains the external reference for the action")
     private String externalRef;
+
 }

hawkbit-mgmt/hawkbit-mgmt-api/src/main/java/org/eclipse/hawkbit/mgmt/json/model/action/MgmtActionStatus.java

@@ -43,6 +43,10 @@ public class MgmtActionStatus {
     @Schema(example = "1691065929524")
     private Long reportedAt;
 
+    @JsonProperty
+    @Schema(example = "1691065929524")
+    private Long timestamp;
+
     @JsonProperty
     @Schema(example = "200")
     private Integer code;