az cosmosdb copy changes time values

### Describe the bug

I used the `az cosmosdb copy` operation to copy items from a container in a nosql database in one cosmos db account to another account. The items in the source container included a `/time` field with UTC formatted values (e.g. `"time": "2023-11-28T15:55:17.000000Z"`. In the destination container, these fields were written as `"time": "2023-11-28T15:55:17Z"` instead.

### Related command

az cosmosdb copy

### Errors

No error occurred.

### Issue script & Debug output

I can't re-run this long operation to provide debug output.

### Expected behavior

The items should be copied without changing user-inputted fields in any way whatsoever.

### Environment Summary

azure-cli 2.71.0 *

core 2.71.0 *
telemetry 1.1.0

Extensions:
cosmosdb-preview 1.2.1

Dependencies:
msal 1.31.2b1
azure-mgmt-resource 23.1.1

### Additional context

_No response_