Error: UserStorageController - failed to save account to user storage - failed to upsert user storage for path 'accounts_v2.**'. Snap execution service returned no RPC handler for running snap "npm:@metamask/message-s...

Sentry Issue: [METAMASK-MOBILE-3PG0](https://metamask.sentry.io/issues/6565686537/?referrer=github_integration)

```
Error: UserStorageController - failed to save account to user storage - failed to upsert user storage for path 'accounts_v2.**'. Snap execution service returned no RPC handler for running snap "npm:@metamask/message-s...
at ?anon_0_ (node_modules/@metamask/profile-sync-controller/dist/controllers/user-storage/account-syncing/controller-integration.cjs:35:24)
at throw (native)
at asyncGeneratorStep (node_modules/@babel/runtime/helpers/asyncToGenerator.js:3:17)
at _throw (node_modules/@babel/runtime/helpers/asyncToGenerator.js:20:27)
at tryCallOne (node_modules/promise/setimmediate/core.js:37:14)
...
(11 additional frame(s) were not displayed)
```

Start with the stack trace location in node_modules/@metamask/profile-sync-controller/dist/controllers/user-storage/account-syncing/controller-integration.cjs and trace the UserStorageController account-syncing integration into the mobile app. Reproduce or inspect the Sentry issue to determine why the running snap has no RPC handler; done means the failing account-storage operation no longer produces this error and the relevant behavior is covered by an existing or added test.

Written by the indexing model from the issue text.