Add private channels to channel list command

Description

Right now the channel list command only lists the public channels for a team. We should add the capability to list the private channels that the user is a member of or has the permissions to list.

Request coming from the community server

QA Test Steps

None

Mana

None

Assignee

Unassigned

QA Assignee

None

Reporter

Miguel de la Cruz

Epic Link

Fix versions

None

Mattermost Team

Platform

Sprint

Labels

None

QA Testing Areas

CLI

GitHub Issue

None

Components

None
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