[GH] (iceberg-rust/main): Workflow run "CI" failed!

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The GitHub Actions job "CI" on iceberg-rust.git/main has failed.
Run started by GitHub user liurenjie1024 (triggered by liurenjie1024).

Head commit for run:
a4054140d9ea66022a11835afa3a68bc4eb72cec / André Eickler 
<797483+eick...@users.noreply.github.com>
fix: MemoryCatalog to return absolute NamespaceIdents (#1970)

## Which issue does this PR close?

- Closes #1969.

## What changes are included in this PR?

The change makes `list_namespaces(parent)` return an absolute namespace
identifier instead of a relative.

## Are these changes tested?

The associated unit tests are updated with the same behaviour as
SqlCatalog.

Report URL: https://github.com/apache/iceberg-rust/actions/runs/20586646590

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