[FEATURE REQ] Flag to disable extract of global policy

### Please describe the feature.

The ApiOps documentation describes a model for supporting distributed API teams working with a single API Management set of resources. The approach describes each team having a dedicated repository and using the Extractor configuration file to control which APIM resources are extracted.

One challenge with this approach is that with the current implementation of the Extractor, each team would end up extracting APIM's global policy. This means teams could potentially introduce global policy changes that introduces issues for other teams using the same APIM. Ideally, customers should have the ability to disable extracting global policy. This would ensure each independent API team doesn't need to extract global policy and customers could have a central team that manages global policy through a separate repo.

まず、issue で説明されている Extractor の実装と設定ファイルを見つけ、次に抽出対象のグローバルポリシーがどのように選択されるかを追跡します。既存の抽出テストでグローバルポリシーがカバーされているかを確認し、無効化オプションがどこで検証されるかを特定します。他の APIM リソースの抽出を継続しながら、チームがグローバルポリシーの抽出を無効化できれば完了です。

索引モデルが issue の本文から書いたものです。