Review positional arguments in commands

[mrodm]

This PR reviews usage of positional arguments in all commands and sub-commands.
Currently, if a positional argument is set in the command line, this parameter is ignored. I think that could be misleading.

This PR enforces to not use positional arguments if they are not needed.
As an example:

• Use of a positional argument where it is not used by the command:

 $ elastic-package clean aa
Clean used resources
Build resources removed: /home/mariorodriguez/Coding/work/integrations/build/packages/elastic_package_registry
Temporary service logs removed: /home/mariorodriguez/.elastic-package/tmp/service_logs
Done

• With this PR, that would raise an error:

 $ elastic-package clean aa
Error: unknown command "aa" for "elastic-package clean"

In case of elastic-package test and elastic-package benchmark commands the same positional arguments has been kept. Keeping that would show a more specific error for those commands.

Example:

• Current error shown:

 $ elastic-package test aaa
Run test suite for the package
Error: unsupported test type: aaa

• If it is used cobra.NoArgs:

 $ elastic-package test aaa
Error: unknown command "aaa" for "elastic-package test"

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: 49be580

cc @mrodm

[jsoriano]

Good one! 🚀