[BUG] "Microsoft.Maintenance/configurationAssignments@2023-04-01" returns `ResourceId` and `MaintenanceConfigurationId` in lowered case

### API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/4f4f1f7dc11e7446c62621607eb86c237dcb1d38/specification/maintenance/resource-manager/Microsoft.Maintenance/stable/2023-04-01/Maintenance.json#L727

### API Spec version

2023-04-01

### Describe the bug

The `ResourceId` and `MaintenanceConfigurationId` are both returned in lowered case, which shall be as same as input

***input***
resourceID: `/subscriptions/{sub_id}/resourceGroups/test-RG/providers/Microsoft.HybridCompute/machines/vm1`
MaintenanceConfigurationId:`/subscriptions/{sub_id}/resourceGroups/test-RG/providers/Microsoft.Maintenance/maintenanceConfigurations/TEST`

***response***
resourceID:`/subscriptions/{sub_id}/resourcegroups/test-rg/providers/microsoft.hybridcompute/machines/vm1`
MaintenanceConfigurationId:`/subscriptions/{sub_id}/resourcegroups/test-rg/providers/microsoft.maintenance/maintenanceconfigurations/test`

### Expected behavior

the returned value shall be as same as input

### Actual behavior

the returned values are lower-cased.

### Reproduction Steps

call `ConfigurationAssignments_Get` with an assigment resource

### Environment

_No response_

Start by reading specification/maintenance/resource-manager/Microsoft.Maintenance/stable/2023-04-01/Maintenance.json at line 727 and inspect the ConfigurationAssignments_Get response. Done means the specification accounts for ResourceId and MaintenanceConfigurationId being returned with the same casing as their inputs.

Written by the indexing model from the issue text.