feat(CLI): key cleanup using batches #SCD-687

[jablan]

New upload batches API endpoint enables us to perform unmentioned keys cleanup before waiting for all the uploads to finish. This PR makes use of this change and also introduces delete_unmentioned_keys as a configuration file parameter, so it doesn't need to be specified as the CLI argument.

[Copilot]

Pull request overview

This PR introduces the ability to perform key cleanup using upload batches, allowing cleanup to be scheduled before uploads complete. The changes replace the previous cleanup mechanism with a new batch-based API endpoint and add delete_unmentioned_keys as a configuration file parameter.

Changes:

• Replaced UploadCleanup function with CreateUploadBatch to use the new upload batches API
• Added delete_unmentioned_keys configuration parameter support in push section
• Restructured configuration to use Push and Pull sections instead of Sources and Targets

Reviewed changes

Copilot reviewed 5 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
clients/cli/cmd/internal/upload_cleanup.go	Updated to call CreateUploadBatch instead of UploadCleanup
clients/cli/cmd/internal/shared.go	Renamed and refactored UploadCleanup to CreateUploadBatch with new batch API
clients/cli/cmd/internal/push_source.go	Modified to read from config.Push and extract delete_unmentioned_keys parameter
clients/cli/cmd/internal/push.go	Updated cleanup logic to work without requiring --wait flag and use config parameter
clients/cli/cmd/internal/pull_target.go	Changed to read from config.Pull instead of config.Targets

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.