Enabling setting host status webhook at the team level via REST API and fleetctl apply/gitops. (#17186)

Enabling setting host status webhook at the team level via REST API and
fleetctl apply/gitops.
#14916

Example payload:
```json
{
    "data": {
        "days_unseen": 3,
        "host_ids": [
            10724,
            10726,
            10738,
            10739,
            10740,
            10741,
            10742,
            10744,
            10745,
            10746,
            10747,
            10748,
            10749
        ],
        "team_id": 3,
        "total_hosts": 15,
        "unseen_hosts": 13
    },
    "text": "More than 86.67% of your hosts have not checked into Fleet for more than 3 days. You've been sent this message because the Host status webhook is enabled in your Fleet instance."
}
```

# Checklist for submitter

- [x] Changes file added for user-visible changes in `changes/` or
`orbit/changes/`.
See [Changes
files](https://fleetdm.com/docs/contributing/committing-changes#changes-files)
for more information.
- [x] Added/updated tests
- [x] Manual QA for all new/changed functionality

cmd/fleetctl/testdata/gitops/team_config_no_paths.yml

@@ -4,10 +4,11 @@ team_settings:
     - secret: "SampleSecret123"
     - secret: "ABC"
   webhook_settings:
-    failing_policies_webhook:
-      enable_failing_policies_webhook: true
-      destination_url: https://example.tines.com/webhook
-      policy_ids: [1, 2, 3, 4, 5, 6 ,7, 8, 9]
+    host_status_webhook:
+      days_count: 14
+      destination_url: https://example.com/host_status_webhook
+      enable_host_status_webhook: true
+      host_percentage: 25
   features:
     enable_host_users: true
     enable_software_inventory: true