Ability to disable auto update to latest version

I would like to be able to disable the auto update.

```
failed to get update the latest version" file=" util/updates/updates.go:54" error="Get \"https://pyroscope.io/latest-version.json\": dial tcp 18.160.18.114:443: i/o timeout"
```

Read util/updates/updates.go around line 54, where the reported latest-version request fails, and trace how update checks are triggered. Identify the existing configuration or startup path involved, then verify that users can disable the check and that the request is skipped when disabled.

Written by the indexing model from the issue text.