[PM-12493] Extract ConfirmUser methods from OrganizationService into commands

[r-tome]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-12493

📔 Objective

This PR extracts the organization user confirmation functionality from the OrganizationService into a dedicated ConfirmOrganizationUserCommand class following the CQRS pattern.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – d757413e-26a1-4938-ac28-46c2ca87188b

New Issues (1)

Checkmarx found the following issues in this Pull Request

Severity	Issue	Source File / Package	Checkmarx Insight
	Missing_CSP_Header	/src/Core/MailTemplates/Handlebars/AdminConsole/OrganizationUserRevokedForSingleOrgPolicy.html.hbs: 5	details A Content Security Policy is not explicitly defined within the web-application. Attack Vector

[codecov]

Codecov Report

Attention: Patch coverage is 92.06349% with 10 lines in your changes missing coverage. Please review.

Project coverage is 44.55%. Comparing base (d345937) to head (e95164f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...rganizationUsers/ConfirmOrganizationUserCommand.cs	94.11%	4 Missing and 3 partials ⚠️
...Console/Controllers/OrganizationUsersController.cs	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5505      +/-   ##
==========================================
+ Coverage   44.54%   44.55%   +0.01%     
==========================================
  Files        1543     1544       +1     
  Lines       70761    70793      +32     
  Branches     6333     6333              
==========================================
+ Hits        31519    31545      +26     
- Misses      37889    37895       +6     
  Partials     1353     1353              

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[sonarqubecloud]

Quality Gate passed

Issues
3 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud