Show MR branch's current commit hash in MR's front page
Context
Please see #200037 (comment 295556199)
Description
With the recent release of the amazing merged pipelines feature #200037 (closed), there's a minor UX consequence. Now the MR's current commit hash is nowhere in the front page of the MR. Instead the pipeline shows the commit of the merge.
I now have to click on "Commits" to get the current commit hash of the MR... Is there a good place we could put this very helpful piece of info in the front page in the MR widget?
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