Include push ruleable concern in group_push_rule model

Javiera Tapiarequested to merge
jtapiab/499153-include-push-ruleable-concern-in-group-push-rules into master

What does this MR do and why?

This MR uses the shared logic from PushRuleable concern and includes it in the new GroupPushRule model.

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Related to #499153 (closed)

Edited by Javiera Tapia

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