Gitlab webhook merge requests don't pass squash commit sha in body

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Summary

Gitlab webhooks events don't pass squashed commit SHA in the body when clients are using squash & fast-forward merge.

Steps to reproduce

1. setup webhook
2. set Merge method to `Fast Forward Only`
3. prepare PR with 2 commits
4. select Squash commits in MR
5. merge MR
6. observe in the webhook data that no `merge_commit_sha` is passed & that the last commit is useless since it points to the last commit non-squashed commit

Example Project

/ currently a private project, can open if needed

What is the current bug behavior?

No squash_commit_sha is passed in the webhook event, but it is passed in API call

What is the expected correct behavior?

squash_commit_sha is passed in the same as in API response