[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.

Commencez par localiser l’implémentation de Extractor et le fichier de configuration décrits dans l’issue, puis suivez la manière dont la stratégie globale est sélectionnée pour l’extraction. Vérifiez si les tests d’extraction existants couvrent la stratégie globale et identifiez où une option de désactivation serait validée. Le travail est terminé lorsque les équipes peuvent désactiver l’extraction de la stratégie globale tout en continuant à extraire les autres ressources APIM.

Rédigé par le modèle d'indexation à partir du texte de l'issue.