This improves the installerstore CLI tool with:
- The ability to create tests buckets for local development (otherwise you have to interact with another CLI or the MinIO UI)
- Improved error handling and messaging.
Related to #6365 this adds a new tool to upload pre-built Orbit installers to a storage blob. It uses the same file conventions that the Fleet server expects, making it useful for local testing and infra envs alike.\
Usage and details in the README
