[FEATURE REQ] Support renaming named values

### Please describe the feature.

If a named value with the same `displayName` but a different `name` does already exist in APIM while publishing the following error is emitted

```
##[error]System.Net.Http.HttpRequestException: HTTP request to URI https://management.azure.com/subscriptions/***/resourceGroups/***/providers/Microsoft.ApiManagement/service/***/namedValues/MyNamedValue?api-version=2023-09-01-preview&asyncId=69c299e5f0b6541b0829f74c&asyncCode=201 failed with status code 400. Content is '{"error":{"code":"ValidationError","message":"One or more fields contain incorrect values:","details":[{"code":"ValidationError","target":"name","message":"Property with the same name already exist."}]}}'.
```

Currently this requires manual deletion of the existing named value before publishing succeeds. Would be nice to automatically such cases within the publisher client.