cmd: consistently output to stdout without logging

Currently, some of the commands write into the stdout directly or through logging.

Ideally, CLIs would write into stdout only without a logger or anything. Usually, when you run some CLI util, it does not have fancy logging in it. This is true for the panic/fatal log we introduce this logger for and for other possible cases where something needs to be logged out.
Super minor though, and we had a logger here before, which was not the best thing todo

_Originally posted by @Wondertan in https://github.com/celestiaorg/celestia-node/pull/1067#discussion_r971913770_

Start by auditing the commands under cmd and identify which paths write output through logging instead of stdout. Trace the panic and fatal logging cases mentioned in the issue, then verify that CLI output consistently uses stdout without the logger.

Written by the indexing model from the issue text.