[PM-33046] Remove legacy in-memory application cache services

[JimmyVo16]

🎯 Objective

Part of removing the legacy in-memory application cache system (PM-33046).

Ticket: https://bitwarden.atlassian.net/browse/PM-33046

⚠️ Merge order (important)

This is one atomic removal split into 4 stacked-by-dependency PRs, all based on main. To keep main compiling and runtime-safe, they must merge in this order:

1. events-di (Data Insights & Reporting) — remove DI consumer in Events
2. core-services (Core / platform) — delete cache service impls + SharedWeb DI
3. admin-console-repos (Admin Console) — delete cache interface + GetManyAbilitiesAsync repo methods
4. dbops-drop-procs (DB Ops) — drop the stored procedures the Dapper code called

👉 This PR is step 2 of 4. Do not merge before the step above it.

📋 Code Changes

• src/Core/Services/Implementations/InMemoryApplicationCacheService.cs — deleted
• src/Core/Services/Implementations/InMemoryServiceBusApplicationCacheService.cs — deleted
• src/SharedWeb/Utilities/ServiceCollectionExtensions.cs — remove DI registration
• test/Core.Test/Services/InMemoryApplicationCacheServiceTests.cs — deleted
• test/Core.Test/Services/InMemoryServiceBusApplicationCacheServiceTests.cs — deleted

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.67%. Comparing base (c9460cc) to head (7d91d08).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7959      +/-   ##
==========================================
+ Coverage   61.60%   61.67%   +0.06%     
==========================================
  Files        2256     2254       -2     
  Lines       99392    99267     -125     
  Branches     8983     8978       -5     
==========================================
- Hits        61232    61220      -12     
+ Misses      36005    35893     -112     
+ Partials     2155     2154       -1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed the removal of the legacy in-memory application cache services (InMemoryApplicationCacheService, InMemoryServiceBusApplicationCacheService), their SharedWeb DI registration, and the corresponding placeholder tests. This is step 2 of a 4-PR stacked removal for PM-33046.

Verified that both deleted implementation classes have zero remaining references, the removed DI block was the only registration path (its consumers were migrated in step 1), and the replacement AddOrganizationAbilityCache / AddProviderAbilityCache registrations remain in place. The now-orphaned IVCurrentInMemoryApplicationCacheService interface is intentionally deleted in step 3 per the documented merge order.

Code Review Details

No findings. Clean, well-scoped tech-debt removal with clearly documented stacked-merge ordering.