Refactor cmd tasks and ports supervisor related func

[mustard-mh]

Description

Currently command gp tasks and gp ports not handle errors properly, i.e.

• Command not stop when supervisor grpc connect failed (supervisor.Dial func)
• Log with Error not Fatal and without return
• Package of client of supervisor called supervisor can be confusing

This PR

• Move command files into package cmd
• Rename truly supervisor package from api to supervisor
• Move client of supervisor into supervisor-helper folder
• Fix i.e. problem above

For gp tasks

• We don't change its logic, in case break something. If we want to refactor it, another PR will be good
• Update GetTasksList func for the same reason

Related Issue(s)

Fixes #

How to test

• Start a workspace with current PR in preview env
• cd /workspace/gitpod/components/gitpod-cli
• Check if go run main.go tasks xxx behave the same with gp tasks xxx
• Check if gp ports list behave the same with prev PR [gitpod-cli] Add command 'gp ports list' #10388

Release Notes

NONE

Documentation

[iQQBot]

how about move cmd/task/* and cmd/ports/* to cmd folder?
Ask because all the other commands are in the same hierarchy

[felladrin]

how about move cmd/task/* and cmd/ports/* to cmd folder?
Ask because all the other commands are in the same hierarchy

I'm ok with that 👍

Then you could also move the contents from ports-list.go into ports.go, @mustard-mh.
They were separated just because I was following the 'tasks' command structure. But I guess it will be easier to find anything related to gp ports if it's all inside the same file.

[felladrin]

Code reviewed and commands (ports/tasks) tested! ✅