CHW-4812 UploadVersionConflict

this package version already exists; delete it first to republish, or publish a new version

Default message: this package version already exists; delete it first to republish, or publish a new version
HTTP status: 409 (client)

Problem. Upload refused because the (package, version) pair already exists. Cause. Package versions are immutable; once published, the same version cannot be overwritten. Fix. Delete the existing version first or bump the version number and republish. HTTP 409.