🧹 Remove unused imports in test_resource_resolution_receipt.py

[joy7758]

🎯 What: Removed unused imports (datetime, timezone, json, random, string) from tests/test_resource_resolution_receipt.py.
💡 Why: To improve code clarity and hygiene by removing dead code.
✅ Verification: Verified by running the test suite (PYTHONPATH=. python -m pytest tests/), ensuring no regressions occurred.
✨ Result: A cleaner test file that is easier to maintain.

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PR created automatically by Jules for task 14262004485232232819 started by @joy7758

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