[PM-13790] Remove RefactorOrganizationUserApi feature flag

[eliykat]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-13790

📔 Objective

Delete the Pm3478RefactorOrganizationUserApi feature flag. It has been turned on in production and is no longer required.

It is only consumed by the web client which is always updated in step with server. We don't need to persist it for the 3 month support window.

Clients PR: bitwarden/clients#11662

📸 Screenshots

⏰ 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]

LaunchDarkly flag references

❌ 1 flag removed

Name	Key	Aliases found	Info
[H1] Implement new mini-details Organization User endpoint	pm-3478-refactor-organizationuser-api		✅ all references removed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.27%. Comparing base (a952d10) to head (31e07db).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4931      +/-   ##
==========================================
- Coverage   42.29%   42.27%   -0.02%     
==========================================
  Files        1384     1384              
  Lines       64528    64514      -14     
  Branches     5930     5928       -2     
==========================================
- Hits        27289    27275      -14     
  Misses      36010    36010              
  Partials     1229     1229              

☔ View full report in Codecov by Sentry.
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[github-actions]

Checkmarx One – Scan Summary & Details – e5024baa-e912-4ebc-8de5-716579449bf6

Fixed Issues

Severity	Issue	Source File / Package
	CSRF	/src/Admin/AdminConsole/Controllers/ProvidersController.cs: 427
	CSRF	/src/Admin/AdminConsole/Controllers/ProvidersController.cs: 352

[eliykat]

Holding this one until clients is also approved.