remove unused hasLabel import in unassign command

[davin-core]

Remove unused hasLabel import from .github/scripts/commands/unassign.js to clean up the code and reduce confusion for new contributors.

Remove hasLabel from the destructured import at line 13

Preserve all other imports and existing logic

Fixes #1255

[github-actions]

Hey @davin-core 👋 thanks for the PR!
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✅ Issue Link -- Linked to #1255 (assigned to you).

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[rwalworth]

LGTM - the change is exactly right. Once we get an approval from @hiero-ledger/github-maintainers, we'll get this merged!

Congratulations on your first contribution to the Hiero C++ SDK, @davin-core! 🎉 Thank you for taking the time to contribute!