Show push event details in notifications

[sargsyan]

Is your feature request related to a problem? Please describe.
Currently, whenever user pushes commits into a repository , the applications shows somebody updated the repository, without saying type of the update, and what has been changed. Mostly these happens when users push commits

Describe the solution you'd like
Whenever there is a push, the title of the notifications can be " pushed commits to PR". The body of the notifications will ideally show the list of the commits, line by line