Show "Squash commits when merge request is accepted." is enabled or not on MR
## Problem
I cannot see if an MR has `Squash commits when merge request is accepted.` enabled or not

## Workaround
* Wait until I approve the MR
* Go "Edit" the MR to see if the `Squash commits when merge request is accepted.` checkbox is enabled
## Proposal
Show on the MR widget somewhere if `Squash commits when merge request is accepted.` is enabled
issue