Proposal: Change loglevel to Warning for duplicate priorities in pubsub topic subscriptions

I have multiple `TopicAttribute`s on the same topic with different filters. The priority of the filters doesn't matter, because they don't overlap. Without a priority on the attribute, the SDK will log the error below. In my opinion this should be warning instead of an error, because:

- The application continues execution and is functioning properly
- Monitoring tools will pick up the false-positive error

https://github.com/dapr/dotnet-sdk/blob/e6ded69ca440e6767e96e0c128cbb920f1ee4070/src/Dapr.AspNetCore/DaprEndpointRouteBuilderExtensions.cs#L126

Let me know what you think, I can submit a PR if you want.