copy: add slug_perm to output

[ThomasAdam]

When using the copy command to copy packages between repositories, the unique ID
(slug_perm) of the package wasn't being printed to stdout. As with other commands
(such as 'push') which did, the output of this could then be parsed to further operate
on the specific package.

Therefore, make the output from 'copy' behave in the same way.

[qlty-cloud-legacy]

Code Climate has analyzed commit bda37d7 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 0.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 1.2% (0.0% change).

View more on Code Climate.

[lskillen]

Here is an overview of what got changed by this pull request:

Clones removed
==============
+ cloudsmith_cli/cli/commands/copy.py  -1
         

See the complete overview on Codacy

[Copilot]

Pull request overview

Adds the package unique ID (slug_perm) to cloudsmith copy success output so downstream tooling can reliably identify the copied package, aligning behavior with push and other package-creation flows.

Changes:

• Capture and surface slug_perm returned by the API when copying a package.
• Print a human-readable Copied: owner/repo/slug (slug_perm) success line (stderr in JSON modes, stdout otherwise).
• Include slug_perm in -F json / -F pretty_json status output and document the change in the changelog.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
cloudsmith_cli/cli/commands/copy.py	Prints slug_perm after successful copy and includes it in JSON status output.
CHANGELOG.md	Documents the updated cloudsmith copy output behavior under Unreleased.

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