fix(collector): ignore bit 6 in smartctl exit-code during detect

[Starosdev]

Summary

Smartctl exit code bit 6 indicates "Device error log contains records of errors" which is informational and doesn't mean the device info retrieval failed. This fix ignores bit 6 (masking with 0xBF) to prevent false failures during device detection when drives have historical errors logged.

Origin

• Upstream PR: Ignore bit 6 in smartctl exit-code during detect AnalogJ/scrutiny#794
• Original author: @gboudreau

Changes

• Adds exit code handling in SmartCtlInfo() to mask bit 6
• Logs a warning instead of failing when only bit 6 is set
• Continues processing device info even with historical error logs

Test Plan

• Verify drives with error logs in history are still detected
• Verify actual device errors still cause failures
• Check collector logs show warning message for bit 6 exits