[grenoble] servers - dighyp1, dighyp2, dignfs : remove servers

• https://intranet.grid5000.fr/bugzilla/show_bug.cgi?id=16767
• remove dighyp1, dighyp2, dignfs

data/grid5000/sites/grenoble/servers/dighyp1.json

-{
-  "alias": [
-
-  ],
-  "kind": "physical",
-  "network_adapters": {
-    "adm": {
-      "ip": "172.17.31.7"
-    },
-    "bmc": {
-      "ip": "172.17.30.7",
-      "mac": "D0:94:66:1E:38:4C"
-    },
-    "default": {
-      "ip": "172.16.31.7",
-      "mac": "D0:94:66:1E:38:48"
-    }
-  },
-  "redfish": true,
-  "serial": "5SS15M2",
-  "type": "server",
-  "uid": "dighyp1",
-  "warranty": "2024-10-19"
-}
\ No newline at end of file