Allow publishing to V3 app from V2 Core tools

cc @fabiocav

Publishing to V3 app from V2 Core tools throws following error

```
You're trying to publish to a v1 function app from v2 tooling.
You can pass --force to force update the app to v2, or downgrade to v1 tooling for publishing
```

Start by reproducing publication to a V3 app from the V2 Core tools and capture the exact version and target app details. The issue provides no file, test, or entry point; done means publishing succeeds without the v1-function-app error, while preserving the documented --force and downgrade behaviors.

Written by the indexing model from the issue text.