refactor: distinguish between node and bastion extra volume also by volume name

clouds/g2/ostrava/scalability-test/terraform/modules/common/volumes.tf

 # node extra volumes
 resource "openstack_blockstorage_volume_v3" "nodes_extra_volumes" {
   count       = (var.nodes_extra_volume_size * var.nodes_extra_volume_count > 0) ? (var.nodes_count * var.nodes_extra_volume_count) : 0
-  name        = "${var.infra_name}-extra-volume-${count.index+1}"
+  name        = "${var.infra_name}-node-extra-volume-${count.index+1}"
   size        = var.nodes_extra_volume_size
   volume_type = var.nodes_extra_volume_type
 }