enhancement: do not fail catalystcenter_fabric_l3_handoff_ip_transit apply if api returns "device unreachable"

[jolstorn]

If a fabric-device is unreachable at the moment we do terraform apply of catalystcenter_fabric_l3_handoff_ip_transit, our pipeline fails. Having some devices unreachable is more or less a normal situation in large networks. It it possible to issue a warning and not error due to the following response from API?

│ Error: Client Error
│ 
│   with catalystcenter_fabric_l3_handoff_ip_transit.l3_handoffs["prep-siteb-bn-lab-02/mtu_1/TenGigabitEthernet1/1/3"],
│   on sda_border.tf line 18, in resource "catalystcenter_fabric_l3_handoff_ip_transit" "l3_handoffs":
│   18: resource "catalystcenter_fabric_l3_handoff_ip_transit" "l3_handoffs" {
│ 
│ Failed to configure object (POST), got error: task
│ '01934df0-4111-7b14-ab49-84ceada1c80d' failed: TASK_MODIFY_PUT, NCDP10000:
│ Configuration failed on device 'prep-siteb-en-01.preprod.lab' due to
│ unreachability.,
│ {"response":{"version":1732179435394,"endTime":1732179435394,"startTime":1732179411217,"data":"workflow_id=609430ba-953a-4460-8b07-29382b3a9ec1;cfs_id=f0817490-8b7f-44b9-9da7-5a[55](https://github.com/SPHF-Nettverk-IaC/datamodel-prephf/actions/runs/11949793843/job/33309981648#step:15:56)f237b737;rollback_status=not_supported;rollback_taskid=0;failure_task=Determination
│ of network intent deployment
│ status:69a315e9-e491-4edb-8333-b36af8765f34;processcfs_complete=true","progress":"TASK_MODIFY_PUT","errorCode":"NCDP10000","lastUpdate":1732179435371,"serviceType":"NCSP","isError":true,"failureReason":"NCDP10000:
│ Configuration failed on device 'prep-siteb-en-01.preprod.lab' due to
│ unreachability.","instanceTenantId":"6446774a7[61](https://github.com/SPHF-Nettverk-IaC/datamodel-prephf/actions/runs/11949793843/job/33309981648#step:15:62)b271fa5e92dd6","id":"01934df0-4111-7b14-ab49-84ceada1c80d"},"version":"1.0"}
╵

I've verified borders and catcenter and the resource has been successfully deployed and the "intent" has been saved for so that offline devices will receive this when they get online.