[PM-33086/7] Remove the feature flag RefactorOrgAcceptInit

[r-tome]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-33086
https://bitwarden.atlassian.net/browse/PM-33087

📔 Objective

Remove the RefactorOrgAcceptInit feature flag, keeping the VNext code path and deleting the legacy InitPendingOrganizationAsync method and its associated tests.

[sonarqubecloud]

Quality Gate passed

Issues
0 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

[github-actions]

Checkmarx One – Scan Summary & Details – a26d4d82-b1c4-447e-9069-793484949405

---

Fixed Issues (2)

Great job! The following issues were fixed in this Pull Request

Severity	Issue	Source File / Package
	CSRF	/src/Api/AdminConsole/Controllers/OrganizationUsersController.cs: 307
	CSRF	/src/Api/AdminConsole/Controllers/OrganizationUsersController.cs: 307

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.80%. Comparing base (2429b45) to head (4f2a864).
⚠️ Report is 69 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7287      +/-   ##
==========================================
- Coverage   57.84%   57.80%   -0.05%     
==========================================
  Files        2043     2043              
  Lines       89866    89796      -70     
  Branches     7988     7977      -11     
==========================================
- Hits        51983    51906      -77     
- Misses      36024    36035      +11     
+ Partials     1859     1855       -4     

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