NAS-130771 / 25.04 / Add RedactedFileMetric and use to redact iSCSI CHAP secrets

[bmeagherix]

Add RedactedFileMetric and use redact_chap_passwords callback to redact iSCSI CHAP secrets.

This will replace the secrets in the copy of /etc/scst.conf.

[bugclerk]

Jira URL: https://ixsystems.atlassian.net/browse/NAS-130771

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.83%. Comparing base (fe4fd3a) to head (98828e4).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #211      +/-   ##
==========================================
+ Coverage   91.65%   91.83%   +0.17%     
==========================================
  Files         102      103       +1     
  Lines        2265     2314      +49     
==========================================
+ Hits         2076     2125      +49     
  Misses        189      189              

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[bugclerk]

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