[PM-24105] Remove usage of getUserKey on keyService (#16626)

• prefer undefined over null
• obtain required UserId once per method, before branching
• guards moved to beginning of methods
* lift UserId retrieval to occur once during import
* remove redundant userId retrieval

apps/cli/src/oss-serve-configurator.ts

@@ -211,6 +211,7 @@ export class OssServeConfigurator {
       this.serviceContainer.sendService,
       this.serviceContainer.sendApiService,
       this.serviceContainer.environmentService,
+      this.serviceContainer.accountService,
     );
   }