test(client): add message assertion test for XCLAIM JUSTID

[Piyush0049]

This pull request updates packages/client/lib/commands/XCLAIM_JUSTID.spec.ts to resolve the inline maintainer TODO (// TODO: test with messages).

Previously, the unit test only asserted behavior against an empty stream ([]). This change adds an end-to-end test case that populates stream entries, moves them to pending status via xReadGroup, claims them using xClaimJustId, and verifies that the returned array of message IDs matches (['1-0', '2-0']). The test is also updated to run across both standalone client and cluster topologies via testUtils.testAll.

Checklist

• Does npm test pass with this change (including linting)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

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[nkaradzhov]

Thanks @Piyush0049, looks good