Event Hub: Providing Partition Key in Event Metadata Not Working

## In what area(s)?

/area runtime

## What version of Dapr?

1.10.5

## Expected Behavior

Using the Dapr .NET SDK, I am trying to bulk publish events to an Azure event hub, while providing a partition key. I am expecting my event hub to receive events whose metadata includes this partition key.

## Actual Behavior

Events received by the event hub do not have a partition key in their metadata.

## Steps to Reproduce the Problem

```
var metadata = new Dictionary
{
["partitionKey"] =
};

await _daprClient.BulkPublishEventAsync(, , telemetryMessages, metadata);
```

## Release Note

RELEASE NOTE: