Make it clear what happens when MRs that share the same commit are merged

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Release notes

TBD

Problem to solve

If two MRs share a commit and a user merges one of those, the other MR will show the user merged it as well, even though no explicit action was taken. This leads to confusion about who did what action and why.

This exact issue happened on a recent MR: gitlab-com/www-gitlab-com!64254 (comment 424541136)

Intended users

• Sasha (Software Developer)

Proposal

MR1: User explicitly merged MR2: User did not explicitly merge MR1 and MR2 share the same commit

Make it clear what happened on the MR2. A potential solution could be providing a simple message on MR2 that it was merged by way of MR1. Also include language they share the same commmit and cross link if possible.