Error: Hex ID must start with 0x prefix

Sentry Issue: [METAMASK-MOBILE-3VB7](https://metamask.sentry.io/issues/6696615102/?referrer=github_integration)

```
Error: Hex ID must start with 0x prefix
at isSamplingMetaMetricsUser (app/core/Engine/controllers/network-controller/utils.ts:139:45)
at shouldCreateRpcServiceEvents (app/core/Engine/controllers/network-controller/utils.ts:118:30)
at trackRpcEndpointEvent (app/core/Engine/controllers/network-controller/messenger-action-handlers.ts:141:34)
at onRpcEndpointDegraded (app/core/Engine/controllers/network-controller/messenger-action-handlers.ts:95:24)
at ?anon_0_ (app/core/Engine/Engine.ts:458:30)
...
(8 additional frame(s) were not displayed)
```

Start at app/core/Engine/controllers/network-controller/utils.ts around lines 118 and 139, then follow the calls through messenger-action-handlers.ts and Engine.ts shown in the stack trace. Review merged pull request #22093 for prior work; done means the reported Hex ID error no longer occurs during degraded RPC endpoint event tracking.

Written by the indexing model from the issue text.