Running publisher with an API that has a VersionSet fails on an 'empty' APIM instance

### Release version

v6.0.1.1

### Describe the bug

When I run the publisher to upload all of my artifacts (one of the apis contains a versionSet into a 'clean' apim instance I get the following error stating that the ApiVersionSet not found.

```bash
System.Net.Http.HttpRequestException: HTTP request to URI failed with status code 404. Content is '{"error":{"code":"ResourceNotFound","message":"ApiVersionSet not found.","details":null}}'
```

### Expected behavior

Publisher would create the API with multiple versions correctly into APIM.

### Actual behavior

Error occurs trying to find the versionSet that is stored in the `apiinformation.json` file. Since it's an empty APIM instance it won't find the versionSet.

### Reproduction Steps

- Create an api that has multiple versions
- Extract that api into your git repo
- Run the publisher on a new APIM instance

まず、空の Azure API Management インスタンスに対して publisher の実行を再現し、次に apiinformation.json のデータを使って versionSet の検索を追跡します。バージョン付き API を作成する前に、publisher が ApiVersionSet の欠如をどこで処理しているかを確認します。複数のバージョンを持つ API の発行が 404 エラーなしで成功すれば完了です。

索引モデルが issue の本文から書いたものです。