[SharingNg] Error message for invalid shares

## Describe the bug
When a user tries to share a resource to a multiple group, then the status code is `400` as expected and we get the following error message:
```json
{
"error": {
"code": "invalidRequest",
"innererror": {
"date": "2024-01-10T04:17:57Z",
"request-id": "prajwol-OptiPlex-3050/ime3dqhKbr-001982"
},
"message": "Key: 'DriveItemInvite.Recipients' Error:Field validation for 'Recipients' failed on the 'len' tag"
}
}
```

The error message seems correct but the format seems kind of odd in long string format. It would be good and readable if the error message is in proper format. Similar message formats can be seen in other invalid requests as well.

## Steps to reproduce
1. user `Alice` creates a resource `textfile.txt`
2. user `Alice` tries to share `textfile.txt` to a multiple group
```
curl -kv -XPOST "https://localhost:9200/graph/v1beta1/drives/{drive-id}/items/{item-id}/invite" -d '{
"recipients": [
{
"@libre.graph.recipient.type": "group",
"objectId": ""
},
{
"@libre.graph.recipient.type": "group",
"objectId": ""
}
],
"roles": [
"1c996275-f1c9-4e71-abdf-a42f6495e960"
]
}' -uAlice:1234
```
cc @fschade