[PM-33046] Remove legacy cache DI registration in Events

[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 1 of 4.

📋 Code Changes

• src/Events/Startup.cs — remove the in-memory app cache service registration

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

Reviewed the removal of the IVCurrentInMemoryApplicationCacheService DI registration from src/Events/Startup.cs (step 1 of 4 in PM-33046). Confirmed no constructor consumers of the interface exist anywhere in the codebase, so removing the registration carries no DI-resolution risk for the Events app. The usingServiceBusAppCache variable remains legitimately used for the ApplicationCacheHostedService registration, and the replacement ability-cache services (AddOrganizationAbilityCache/AddProviderAbilityCache) are already registered.

Code Review Details

No findings. Clean, minimal tech-debt change with clear merge ordering documented across the stacked PR set.