fix: improve output of zot verify

See #2744, there are 2 updates:
1. Silence the usage output in case of config verification errors
2. Wrap the error details in all of the zot configuration errors so they are propagated and shown in stdout for `zot verify`
We also need to keep logging those message to the zot logs file since the same logic is caled in the `zot serve` use case.

Signed-off-by: Andrei Aaron <[email protected]>