[FlyteCTL Feature] Hide global flags when printing help

[eapolinario]

Describe the feature/command for FlyteCTL

The output of flytectl <command> --help includes all global flags, which ends up pushing the useful info about the command too far up in the screen.

Provide a possible output or UX example

Global flags should be hidden and only the available flags for a particular command should show up, including all flags in case we run flytectl --help.

This is possible to be done if we override cobra's usage template.

https://github.com/unionai/cloud/pull/1818 is an implementation of this idea for Cloud.

Are you sure this issue hasn't been raised already?

• Yes

Have you read the Code of Conduct?

• Yes

[Kota-Karthik]

Hello @samhita-alla
I am interested in doing this issue
so kindly assign me this
Thank You : )

[soumya-dash3]

Hello @samhita-alla , can this issue be assigned to me please?

[samhita-alla]

We'll give preference to the contributor who submits the first PR.

[chaohengstudent]

Hi @samhita-alla , I have created an PR for this issue.
Wonder if is possible to assigned this me, thanks a lot!