Classic confinement request for STACKIT CLI

Hi @jslarraz,

The STACKIT CLI can be used to manage STACKIT Cloud resources. It is comparable to Google’s gcloud CLI (for Google Cloud) or Microsoft’s az CLI (for Azure). Both of these were granted “classic” confinement in the Snap store.

In this previous forum post regarding the STACKIT CLI, @sergiusens also compared it to google-cloud-sdk and aws-cli and @ogra suggested the “public cloud agent” category.