[PM-36234] Consolidate into 1 auto confirm organization users command (one that is most performative)

[JaredScar]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-36234

📔 Objective

Consolidates the auto confirm organization users endpoints into 1 command and validator. The more efficient of the two.

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR removes the single-user AutomaticallyConfirmOrganizationUserCommand/validator pair and routes the POST {orgId}/users/{id}/auto-confirm endpoint through the existing bulk command with a one-entry batch. I verified no remaining references to the deleted types, that DI registrations were removed cleanly, and that the deleted tests only covered the removed classes — the bulk command and validator retain their own unit tests plus the existing OrganizationUserControllerAutoConfirmTests integration coverage of this endpoint. I traced the validation, idempotency, event-logging, default-collection, and auto-confirm policy-enforcement paths and found parity with the removed single-user implementation, and confirmed .Single() on the result is safe because the bulk validator always returns exactly one result per requested entry. The dropped userId null check and PerformedBy field were unused for authorization decisions; [Authorize<ManageUsersRequirement>] and [BindOrganization] (which throws NotFoundException for a missing org) preserve the prior 403/404 behavior.

Code Review Details

No findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.64%. Comparing base (17a1912) to head (be1d5fb).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8297      +/-   ##
==========================================
- Coverage   63.67%   63.64%   -0.03%     
==========================================
  Files        2467     2468       +1     
  Lines      105693   105604      -89     
  Branches     9551     9547       -4     
==========================================
- Hits        67295    67207      -88     
- Misses      36082    36087       +5     
+ Partials     2316     2310       -6     

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