[NAVREDESIGN] CollectiblesController support for all accounts

### **Description**

Update `CollectiblesController` to support retrieving collectibles for all accounts

### **Technical Details**

- Assuming the API that `CollectiblesController` communicates with exposes an endpoint for fetching collectibles for all accounts, we'll just need to update the controller to allow for fetching one or more accounts.

### **Acceptance Criteria**

- TBD

### **References**

- Figma - https://www.figma.com/file/qcwJHEEw5qyNru5mbFf6Oq/Nav-Redesign-Breakdown?node-id=102%3A167
- ETA - 5 Days

Locate CollectiblesController and inspect how it currently retrieves collectibles and communicates with the API. Confirm whether an endpoint for one or more accounts exists; completion requires supporting retrieval for all accounts, but the issue provides no defined acceptance criteria or test location.

Written by the indexing model from the issue text.