[PM-18064] Resolve billing warnings

[justindbaur]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-18064

📔 Objective

Fix all billing related warnings.

📸 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]

Checkmarx One – Scan Summary & Details – a3602df8-f319-4d28-967f-3c6da7cb986a

Great job, no security vulnerabilities found in this Pull Request

[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

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 47.19%. Comparing base (2918d46) to head (9642579).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...lling/Controllers/OrganizationBillingController.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5797      +/-   ##
==========================================
- Coverage   50.39%   47.19%   -3.20%     
==========================================
  Files        1646     1646              
  Lines       75008    75008              
  Branches     6782     6782              
==========================================
- Hits        37797    35400    -2397     
- Misses      35665    38124    +2459     
+ Partials     1546     1484      -62     

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