[ps-2003] Ps/ps 1854 fix pin (#4193)

* Await in `has` calls.

* Add disk cache to browser synced items

Note: `Map` doesn't serialize nicely so it's easier to swap over to a
`Record` object for out cache

* Mock and await init promises in tests

* Remove redundant settings checks

libs/common/src/services/memoryStorage.service.ts

@@ -18,7 +18,7 @@ export class MemoryStorageService
   }
 
   async has(key: string): Promise<boolean> {
-    return this.get(key) != null;
+    return (await this.get(key)) != null;
   }
 
   save(key: string, obj: any): Promise<any> {