Fix hsetex FXX enum usage

[abrookins]

Summary

• use HashDataPersistOptions.FXX when calling redis.hsetex() in extract_memory_structure
• update the regression test to assert the enum value expected by the redis client

Testing

• make test-api
• make pre-commit

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Note

Low Risk
Low risk: a small compatibility fix that changes only the redis.hsetex() argument type and updates the corresponding unit test assertion, without altering memory extraction logic or data formats.

Overview
Fixes the extract_memory_structure Redis write guard to pass HashDataPersistOptions.FXX (instead of the string "FXX") to redis.hsetex(), matching the redis-py client’s expected API.

Updates the regression test to assert the enum value is used when calling hsetex, keeping the atomic “only update if fields exist” behavior intact.

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