`az --version` performs an update check

### Describe the bug

When running `az --version` an update check is performed against az-cli and the extensions.

Azure Pipelines' AzureCLI task runs `az --version` to capture the version details in the logs.

It would save quite a bit of CPU if az-cli would not perform an update check in a CI/CD scenario.

There already is an core.auto-upgrade=false option, would it not make sense to piggy back on that or to add another config setting to turn off update checking.

### Related command

`az --version`

### Errors

N/a

### Issue script & Debug output

N/a

### Expected behavior

No update check is performed in CI.

### Environment Summary

2.52.0

### Additional context

_No response_