feat(har): add DEBIAN, CONAN, PUPPET, and HELM_HTTP registry migration

[BlueLabelscotch]

Summary

• Extend harness execute registry:migrate with legacy-parity support for DEBIAN, CONAN, PUPPET, and HELM_HTTP artifact types (JFrog → HAR).
• Add JFrog enumeration, migratable transfer paths, HAR upload clients, and shared util helpers (conan_util, helm_util, puppet_util).
• Independent of the Harbor source PR — new artifact types only (no Harbor adapter changes).

Details

• DEBIAN — discover from dists/ metadata (Packages / Sources); migrate .deb / .dsc and associated source files.
• CONAN — parse Conan v2 layout; upload recipe/package files with conflict → skip handling.
• PUPPET — discover modules/versions from tarball names; file-level copy to HAR Puppet upload API.
• HELM_HTTP — enumerate charts (tree + index.yaml); upload chart + optional .prov as RAW; Pre skip via VersionExists.