Add the ability to select approver groups in the automation

Problem statement

Currently, in the automation rules: action, it's possible to select the approvers but it requires individual users to be selected.

Suggested solution

Add the ability to select approver groups in the automation rules: action

Why is this important

In the even that the approvers list require change, admins would need to edit the whole automation rule to make sure that each approvers are current. If a group can be selected, we can maintain them from the User Management directly.