[PM-26793] Fetch premium plan from pricing service

[amorask-bitwarden]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-26793

📔 Objective

When the feature flag pm-26793-fetch-premium-price-from-pricing-service is enabled, fetches premium price data from the Pricing Service using the endpoint added here: https://github.com/bitwarden/billing-pricing/pull/41 and then surfaces it through its own endpoint in API for consumption by the web app.

Pricing Service PR: https://github.com/bitwarden/billing-pricing/pull/41
Clients PR: bitwarden/clients#16858

📸 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 – bf8be232-f6d6-4334-9425-2ca5bc82e146

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

❌ Patch coverage is 25.00000% with 54 lines in your changes missing coverage. Please review.
✅ Project coverage is 50.71%. Comparing base (42568b6) to head (0fc4271).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/Core/Billing/Pricing/PricingClient.cs	2.32%	41 Missing and 1 partial ⚠️
src/Api/Billing/Controllers/PlansController.cs	0.00%	4 Missing ⚠️
...vices/Implementations/PremiumUserBillingService.cs	40.00%	3 Missing ⚠️
...e/Services/Implementations/StripePaymentService.cs	0.00%	3 Missing ⚠️
src/Core/Services/Implementations/UserService.cs	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6450      +/-   ##
==========================================
- Coverage   50.73%   50.71%   -0.03%     
==========================================
  Files        1866     1868       +2     
  Lines       82705    82742      +37     
  Branches     7310     7324      +14     
==========================================
- Hits        41961    41960       -1     
- Misses      39143    39179      +36     
- Partials     1601     1603       +2     

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