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Rake: Expand hash validation to support FIPS migration scenarios

Clemens Beckrequested to merge
574605-refactor-rake-for-bcrypt into master

What does this MR do and why?

Rake: Expand hash validation to support FIPS migration scenarios

Enhanced gitlab:password:fips_check_salts to validate both PBKDF2 and bcrypt password hashes during non-FIPS to FIPS migrations.

Previously, the task only validated PBKDF2 hashes and salt lengths. However, instances migrating from non-FIPS environments may have bcrypt passwords requiring migration.

The updated rake task now validates:

  • Hash strategy compliance
  • Work factor requirements (bcrypt hashes)
  • Salt length specifications (PBKDF2 hashes)

Closes #574605

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