[PM-13706] Add repository + stored procedures for private key regeneration

[Thomas-Avery]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-13706

📔 Objective

The purpose of this PR is to add the database stored procedure and repository layer for the private key regeneration project.

This initial phase will only target users not in organizations and without emergency access setup.
In future PRs, the database operations will expand to handle these cases.

📸 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

[codecov]

Codecov Report

Attention: Patch coverage is 2.43902% with 40 lines in your changes missing coverage. Please review.

Project coverage is 43.06%. Comparing base (fae8692) to head (460c098).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ement/Repositories/UserAsymmetricKeysRepository.cs	0.00%	19 Missing ⚠️
...ement/Repositories/UserAsymmetricKeysRepository.cs	0.00%	17 Missing ⚠️
...re/KeyManagement/Models/Data/UserAsymmetricKeys.cs	0.00%	3 Missing ⚠️
...ucture.Dapper/DapperServiceCollectionExtensions.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4898      +/-   ##
==========================================
- Coverage   43.09%   43.06%   -0.03%     
==========================================
  Files        1414     1417       +3     
  Lines       64808    64849      +41     
  Branches     5925     5927       +2     
==========================================
+ Hits        27929    27930       +1     
- Misses      35645    35685      +40     
  Partials     1234     1234              

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[github-actions]

Checkmarx One – Scan Summary & Details – bcd19b60-83c0-4f55-b073-ff2ed01b7173

New Issues

Severity	Issue	Source File / Package	Checkmarx Insight
	CSRF	/src/Billing/Controllers/PayPalController.cs: 66	Attack Vector
	Missing_HSTS_Header	/src/Admin/Views/Home/Index.cshtml: 14	Attack Vector
	Missing_CSP_Header	/src/Core/MailTemplates/Handlebars/FamiliesForEnterprise/FamiliesForEnterpriseRemovedFromFamilyUser.html.hbs: 5	Attack Vector

Fixed Issues

Severity	Issue	Source File / Package
	CSRF	/src/Billing/Controllers/RecoveryController.cs: 38
	CSRF	/src/Billing/Controllers/StripeController.cs: 164
	CSRF	/src/Api/AdminConsole/Public/Controllers/MembersController.cs: 95
	CSRF	/src/Admin/AdminConsole/Controllers/OrganizationsController.cs: 372
	Log_Forging	/src/Api/AdminConsole/Controllers/ProvidersController.cs: 72
	Log_Forging	/src/Api/AdminConsole/Controllers/ProvidersController.cs: 72
	Log_Forging	/src/Api/AdminConsole/Controllers/ProvidersController.cs: 72

[mzieniukbw]

LGTM

[rkac-bw]

lgtm

[rkac-bw]

lgtm