`Microsoft.MachineLearningServices` associated resource IDs in workspace are not preserving proper casing

REST API URL:
```
PUT /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-resources/providers/Microsoft.MachineLearningServices/workspaces/test-Workspace?api-version=2019-11-01 HTTP/1.1
```
Body:
```
{
"identity": {
"type": "SystemAssigned"
},
"location": "westus",
"properties": {
"keyVault": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-resources/providers/Microsoft.KeyVault/vaults/testVault",
"applicationInsights": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-resources/providers/microsoft.insights/components/test-AppInsights",
"storageAccount": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-resources/providers/Microsoft.Storage/storageAccounts/teststorageaccount"
},
"sku": {
"name": "Basic"
},
"tags": {}
}
```
After the creation complete, perform a GET request:
```
GET /subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-resources/providers/Microsoft.MachineLearningServices/workspaces/test-Workspace?api-version=2019-11-01 HTTP/1.1
```
Response:
```
{
"id": "/subscriptions/00000000-0000-0000-0000-000000000000/resourceGroups/test-resources/providers/Microsoft.MachineLearningServices/workspaces/test-Workspace",
"name": "test-workspace",
"type": "Microsoft.MachineLearningServices/workspaces",
"location": "westus",
"tags": {},
"etag": null,
"properties": {
"friendlyName": "",
"description": "",
"creationTime": "2020-02-06T06:54:56.5115492+00:00",
"storageAccount": "/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/test-resources/providers/microsoft.storage/storageaccounts/teststorageaccount",
"containerRegistry": null,
"keyVault": "/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/test-resources/providers/microsoft.keyvault/vaults/testvault",
"applicationInsights": "/subscriptions/00000000-0000-0000-0000-000000000000/resourcegroups/test-resources/providers/microsoft.insights/components/test-appinsights",
"hbiWorkspace": false,
"tenantId": "72f988bf-86f1-41af-91ab-2d7cd011db47",
"workspaceId": "d4cfc4fe-1cd7-4881-bc8a-83ca8aaff7cb",
"subscriptionState": null,
"subscriptionStatusChangeTimeStampUtc": null,
"discoveryUrl": "https://westus.experiments.azureml.net/discovery"
},
"identity": {
"type": "SystemAssigned",
"principalId": "539eb439-c316-49af-85af-e462e2ed0b90",
"tenantId": "72f988bf-86f1-41af-91ab-2d7cd011db47"
},
"sku": {
"name": "Basic",
"tier": "Basic"
}
}
```
The IDs in the response lost all their casing, for instance:
* `resourceGroups` -> `resourcegroup`
* `testVault` -> `testvault`
* `test-AppInsights` -> `test-appinsights`

Start with the REST API PUT and GET request/response examples in this issue and compare the submitted associated resource IDs with the returned values. Determine where the casing is specified or transformed, then consider the issue complete when the response preserves the original casing for resourceGroups, vaults, storageAccounts, and applicationInsights.

Written by the indexing model from the issue text.