[Enhancement] Remove endpoint check in subcmd path to allow --help and exploration of cli without a system

[zhill]

The current implementation uses some checks of the creds/endpoint config nested at the command group level, which means that if you do not have a running engine with valid creds, you cannot explore the CLI optinos and --help output.

The cli should allow any command's --help to work without a configured and available endpoint.

[nightfurys]

@dspalmer99 the PR needs to be rebased. Can we get it reviewed and merged for next release?