🗃️ refactor: Separate Tool Cache Namespace for Blue/Green Deployments (#11738)

* 🔧 refactor: Introduce TOOL_CACHE for isolated caching of tools

- Added TOOL_CACHE key to CacheKeys enum for managing tool-related cache.
- Updated various services and controllers to utilize TOOL_CACHE instead of CONFIG_STORE for better separation of concerns in caching logic.
- Enhanced .env.example with comments on using in-memory cache for blue/green deployments.

* 🔧 refactor: Update cache configuration for in-memory storage handling

- Enhanced the handling of `FORCED_IN_MEMORY_CACHE_NAMESPACES` in `cacheConfig.ts` to default to `CONFIG_STORE` and `APP_CONFIG`, ensuring safer blue/green deployments.
- Updated `.env.example` with clearer comments regarding the usage of in-memory cache namespaces.
- Improved unit tests to validate the new default behavior and handling of empty strings for cache namespaces.

packages/data-provider/src/config.ts

@@ -1364,6 +1364,10 @@ export enum CacheKeys {
    * Key for the config store namespace.
    */
   CONFIG_STORE = 'CONFIG_STORE',
+  /**
+   * Key for the tool cache namespace (plugins, MCP tools, tool definitions).
+   */
+  TOOL_CACHE = 'TOOL_CACHE',
   /**
    * Key for the roles cache.
    */