fix(admin-cli): accept RPC UUID IDs in expected machine JSON

[behroozrafii]

Fix expected-machine JSON imports when id is serialized as an RPC UUID object instead of a plain string.

The importer now accepts missing IDs, string IDs, and object IDs such as {"value":"..."}.

Related issues

Fixes #1877

Type of Change

• Fix - Bug fixes

Breaking Changes

• This PR contains breaking changes

Testing

• Unit tests added/updated

cargo fmt --all -- --check
cargo test -p nico-admin-cli - 374 passed

Additional Notes

This restores compatibility with JSON exported by the CLI and then supplied to replace-all.

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