[PM-28300] Remove BlockClaimedDomainAccountCreation feature flag checks

[r-tome]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-28300

📔 Objective

Remove feature flag checks for BlockClaimedDomainAccountCreation.

Clients PR.

⏰ 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 – 8e117b42-469f-449a-b222-b0ac28fd7ae8

New Issues (1)

Checkmarx found the following issues in this Pull Request

#	Severity	Issue	Source File / Package	Checkmarx Insight
1		CSRF	/src/Api/Auth/Controllers/AccountsController.cs: 291	details Method at line 291 of /src/Api/Auth/Controllers/AccountsController.cs gets a parameter from a user request from model. This parameter value flow... Attack Vector

Fixed Issues (1)

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

Severity	Issue	Source File / Package
	CSRF	/src/Api/KeyManagement/Controllers/AccountsKeyManagementController.cs: 145

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 56.27%. Comparing base (0159052) to head (3db0194).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6934      +/-   ##
==========================================
- Coverage   60.21%   56.27%   -3.95%     
==========================================
  Files        1976     1976              
  Lines       87536    87522      -14     
  Branches     7810     7807       -3     
==========================================
- Hits        52714    49249    -3465     
- Misses      32907    36443    +3536     
+ Partials     1915     1830      -85     

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[Patrick-Pimentel-Bitwarden]

👍 Auth changes look good!

[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