[PM-16095] feat: Enhance provider seat limit validation messages

[JaredScar]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-16095

📔 Objective

Fixes error message for reseller orgs to say how many seats they have in the error message explicitly

📸 Screenshots

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed this bugfix that enhances provider reseller seat-limit validation messages to include the explicit seat count. Changes span ProviderResellerSeatLimitError, the InvitingUserOrganizationProviderValidator signature (now takes int? seats), its single caller in InviteUsersPasswordManagerValidator, and the parallel message in OrganizationService.CanScaleAsync. The single caller and its test were both updated consistently, and no dead references to the removed Code const remain.

Code Review Details

No blocking findings.

The interpolated int? Seats value could theoretically render an empty message if null, but the invite flow returns early when Seats is null before reaching the reseller check, and reseller-managed organizations always have a defined seat count in practice. This matches the existing behavior in CanScaleAsync and is not a concern.

[codecov]

Codecov Report

❌ Patch coverage is 14.28571% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.05%. Comparing base (d6cb0a1) to head (e22c52a).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...ionUsers/InviteUsers/Validation/Provider/Errors.cs	0.00%	4 Missing ⚠️
...wordManager/InviteUsersPasswordManagerValidator.cs	0.00%	1 Missing ⚠️
...vider/InvitingUserOrganizationProviderValidator.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7980      +/-   ##
==========================================
+ Coverage   62.03%   62.05%   +0.02%     
==========================================
  Files        2276     2277       +1     
  Lines       99404    99455      +51     
  Branches     8980     8983       +3     
==========================================
+ Hits        61667    61719      +52     
+ Misses      35565    35563       -2     
- Partials     2172     2173       +1     

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