…check when verifying if the instances scaled up or down successfully (#4649)

* feat(servergroup): Allow users to opt-out of the target desired size check when verifying if the instances scaled up or down successfully

Some of our users prefer to use the actual instance size list to verify if everything was scaled up or down accordingly instead of relying on the target percentage. They noticed this is causing instability on their end

* chore: Update copyright

* refactor: Introduce the ServerGroupProperties which will be used to define all server group related properties

(cherry picked from commit f5fa468)