remove required constraint on both vmid and id params for the delete bkp schedule command

Author: Pearl1594

api/src/main/java/org/apache/cloudstack/api/command/user/backup/DeleteBackupScheduleCmd.java

@@ -55,14 +55,12 @@ public class DeleteBackupScheduleCmd  extends BaseCmd {
     @Parameter(name = ApiConstants.VIRTUAL_MACHINE_ID,
             type = CommandType.UUID,
             entityType = UserVmResponse.class,
-            required = true,
             description = "ID of the VM")
     private Long vmId;
 
     @Parameter(name = ApiConstants.ID,
             type = CommandType.UUID,
             entityType = BackupScheduleResponse.class,
-            required = true,
             description = "ID of the schedule",
             since = "4.20.1")
     private Long id;

server/src/main/java/org/apache/cloudstack/backup/BackupManagerImpl.java

@@ -470,6 +470,9 @@ public List<BackupSchedule> listBackupSchedule(final Long vmId) {
     public boolean deleteBackupSchedule(DeleteBackupScheduleCmd cmd) {
         Long vmId = cmd.getVmId();
         Long id = cmd.getId();
+        if (Objects.isNull(vmId) && Objects.isNull(id)) {
+            throw new InvalidParameterValueException("Either instance ID or ID of backup schedule needs to be specified");
+        }
         if (Objects.nonNull(vmId)) {
             final VMInstanceVO vm = findVmById(vmId);
             validateForZone(vm.getDataCenterId());