CLI prints error message to stdout

[marckhouzam]

Bug description

When a CLI command fails, it prints the error message to stdout when it probably should print it to stderr.

Affected product area (please put an X in all that apply)

• (x) CLI

Expected behavior

Error messages should be printed to stderr

Steps to reproduce the bug

# Error from native command
$ tanzu plugin delete
Error: must provide plugin name as positional argument

✖  must provide plugin name as positional argument

# Redirect stderr from native cmd, final error is still seen on stdout
$tanzu plugin delete 2> /dev/null

✖  must provide plugin name as positional argument

Version (include the SHA if the version is not obvious)

Latest main branch: f297f62

Environment where the bug was observed (cloud, OS, etc)

Locally