Executable sub-commands missing indentation in help text

[marckhouzam]

Bug description

A sub-command that can be run is missing the indentation in its usage line in the help.

$ tz plugin list -h
List installed standalone plugins or plugins recommended by the contexts being used

Usage:
tanzu plugin list [flags]
[...]

compared to non-executable sub-commands, which do have the indentation:

 tz plugin -h
Provides all lifecycle operations for plugins

Usage:
  tanzu plugin [command]

Available Commands:
  clean           Clean the plugins
[...]

Expected behavior

For consistency there should be an indentation in all usage lines.

The problem is the missing spaces before {{.UseLine}} in this line https://github.com/vmware-tanzu/tanzu-cli/blob/334e35d8f0054050a63d36dfdda1877c37304aa6/pkg/cli/usage.go#L101

Steps to reproduce the bug / Relevant debug output

See above.

Output of tanzu version

Today's main: 334e35d8f

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

Locally