cli: simplify --exclude-components business logic

[tiborsimko]

Minor: What do you think about adding a common decorator like, @click_add_exclude_components_option, with a callback that performs this logic, like we do for tokens in R-Client?

We could even have a single option decorator for components @click_add_components_option with the possibility of taking a parameter allow_exclude_components=True so components will always be the result of select components with or without exclude components filter.

@git_commands.command(name="git-fork")
@click_add_components_option
def git_fork(components, ...):
    ...
@git_commands.command(name="git-status")
@click_add_components_option(allow_exclude_components=True)
def git_status(components, ...): 
    ...

Edited: We could create a ticket for it.

Originally posted by @diegodelemos in #443 (comment)