Pushing fewer commits to MR generates no comment or notification

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Repro steps:

1. Push a series of commits (e.g. C1, C2, C3, C4) to a branch.
2. Create an MR from that branch.
3. (Force) push to the same branch, but this time push fewer commits (e.g. just C1, C2) (C1, C2 are the exact same commit IDs, we're just removing C3, C4 from the branch).

Observed:

• No comment is shown in the gitlab MR when the second push is generated.
• No email notification of the push is generated.

Desired:

• A comment is generated in the gitlab MR.
• An email notification is generated.