only output help for subcommands, no aliases

[purplecabbage]

We have commands with a lot aliases, lately this means help text looks like this:

bin/run app add --help
...
COMMANDS
  app add action      Add new actions
  app add actions     Add new actions
  app add event       Add a new Adobe I/O Events action
  app add events      Add a new Adobe I/O Events action
  app add ext         Add new extensions or a standalone application to the project
  app add extension   Add new extensions or a standalone application to the project
  app add extensions  Add new extensions or a standalone application to the project
  app add service     Subscribe to Services in the current Workspace
  app add services    Subscribe to Services in the current Workspace

with this pr, it looks like:

COMMANDS
  app add action      Add new actions
  app add event       Add a new Adobe I/O Events action
  app add extension   Add new extensions or a standalone application to the project
  app add service     Subscribe to Services in the current Workspace

This is currently a draft because I was able to add/change this code without breaking any tests, so likely we are missing some tests for help output.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @purplecabbage to sign the Salesforce.com Contributor License Agreement.

[purplecabbage]

Thanks for the contribution! Before we can merge this, we need @purplecabbage to sign the Salesforce.com Contributor License Agreement.

Done!

[mdonnalley]

I believe the aliases started showing up in the help output after we merged changes to support flexible taxonomy. So thanks for fixing the regression @purplecabbage

Looks like you just need to update the branch with main before I can merge it.

Thanks!

[purplecabbage]

Done. This is ready now thanks.