fix: Emit 'post-execute' hook for commands with async 'run()'

[cb1kenobi]

If a command has a non-callback, async run() implementation, then the post-execute hook is never fired.

For example, the SDK's cli/commands/_build.js exports an async function run(logger, config, cli, finished) function. If the supplied finished() callback is fired, then it emits the event, but if the SDK were to remove the seemingly useless finished() callback, then the post-execute hook is never fired.

To my knowledge, nothing actually listens to the post-execute hook event.

[m1ga]

forgot to approve this.
Looks good, not a hook user and I only find it in two places:
https://grep.app/search?q=cli%3Apost-execute