[PM-18881] /healthz endpoint for Billing

[jonashendrickx]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-18881

📔 Objective

• /healthz endpoint verifying:
  • Entity Framework configuration
  • Stripe configuration
  • more?

📸 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

[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 0% with 36 lines in your changes missing coverage. Please review.

Project coverage is 44.36%. Comparing base (bd7a0a8) to head (ef51de2).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Billing/Startup.cs	0.00%	24 Missing ⚠️
src/Billing/HealthChecks/StripeHealthCheck.cs	0.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5480      +/-   ##
==========================================
- Coverage   44.37%   44.36%   -0.02%     
==========================================
  Files        1534     1535       +1     
  Lines       70505    70528      +23     
  Branches     6316     6316              
==========================================
  Hits        31290    31290              
- Misses      37872    37895      +23     
  Partials     1343     1343              

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[github-actions]

Checkmarx One – Scan Summary & Details – 96220cb7-a9ed-40ee-aeac-f726418e88d7

New Issues (2)

Checkmarx found the following issues in this Pull Request

Severity	Issue	Source File / Package	Checkmarx Insight
	CSRF	/src/Api/Controllers/CollectionsController.cs: 143	details Method Post at line 143 of /src/Api/Controllers/CollectionsController.cs gets a parameter from a user request from model. This parameter value flow... Attack Vector
	CSRF	/src/Api/Controllers/CollectionsController.cs: 171	details Method Put at line 171 of /src/Api/Controllers/CollectionsController.cs gets a parameter from a user request from model. This parameter value flows... Attack Vector

Fixed Issues (21)

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

Severity	Issue	Source File / Package
	CSRF	/src/Api/AdminConsole/Controllers/GroupsController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/RecoveryController.cs: 38
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164
	Log_Forging	/src/Billing/Controllers/StripeController.cs: 164