misc: Refactor more pre-call era services

[vincent-pochet]

Context

This PR follows #2641 and #2645 and keeps refactoring some old service to take advantage of the call pattern and to remove the user arguments used in BaseService#initialize.

Description

This PR:

• Turn the Plans::CreateService#create method into a proper Plans::CreateService#call one
• Remove the need for the current_user argument in Invites::CreateService and move the arguments for the call method to the initializer
• Refact Invites::RevokeService to take the invite as an argument instead if the id and current_organization and move the argument for the call method to the initializer
• Remove the current_user argument for the Invoices::CustomerUsageService