EventHub trigger for Python has wrong cardinality

[jimbobbennett]

When creating an event hub trigger using Python, there is a cardinality mismatch.

The function.json has the following:

{
    "scriptFile": "__init__.py",
    "bindings": [
      {
        "type": "eventHubTrigger",
        "name": "event",
        "direction": "in",
        "eventHubName": "samples-workitems",
        "connection": "",
        "cardinality": "many",
        "consumerGroup": "$Default"
      }
    ]
}

Notice "cardinality": "many"

In the code in __init__.py, the expected cardinality is 1:

def main(event: func.EventHubEvent):

This was changed in #1179 to update the cardinality to one by chaining both the __init__.py file to take a single event, and renaming the name field in the function.json to reflect this, but the cardinality wasn't updated from many to one to match.