Fix KV SLO failure propagation and data checks

[KirillKurdyukov]

Summary

• Propagate unrecovered Table/Query worker errors to the process and SLO gate.
• Check independently expected control generations and payloads after the
  existing SDK retry completes, including errors while consuming streams.
• Keep control tables private to each process and clean them in the existing
  native workload.
• Keep the original direct-exec entrypoint. Do not add a subprocess launcher,
  environment setup or a cleanup orchestrator to the SDK.

The additional entrypoint wrapper was removed in a separate corrective commit.
The native error, retry and control-data checks are unchanged by that removal.

Validation

• The existing TestSloControlData cases passed: 3 passed.
• pip check, sh -n tests/slo/docker-entrypoint.sh and git diff --check
  passed. The entrypoint content and executable mode match the original base.
• Python 3.14 dependency deprecation warnings remain visible.

Hosted SLO/chaos acceptance is not claimed green. The previous head had failing
native jobs and queued async jobs; the corrective head requires its own CI.
Historical local adapter checks are not a substitute for ordinary Action CI.
Transactional concurrent RMW remains a separate change.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.69%. Comparing base (d6391fb) to head (a8e2ae1).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #921      +/-   ##
==========================================
+ Coverage   82.67%   82.69%   +0.01%     
==========================================
  Files          99       99              
  Lines       12961    12961              
  Branches     1269     1269              
==========================================
+ Hits        10716    10718       +2     
+ Misses       1794     1793       -1     
+ Partials      451      450       -1     

Flag	Coverage Δ
integration	80.47% <ø> (+0.02%)	⬆️
unit	49.21% <ø> (ø)

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see 1 file with indirect coverage changes

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[github-actions]

🌋 SLO Test Results

🔴 4 workload(s) tested — 2 workload(s) exceeded failure thresholds

Commit: a3689bb · View run

Workload	Thresholds	Duration	Report
async-topic	🔴 Failure	11m	📄 Report
async-query	🟢 OK	10m 3s	📄 Report
sync-topic	🟢 OK	10m 2s	📄 Report
sync-query	🔴 Failure	4m 53s	📄 Report

Threshold violations:

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Generated by ydb-slo-action