Reposition revert and cherry-pick buttons on MR widget
This issue is part of https://gitlab.com/gitlab-org/gitlab-ce/issues/33095 ### Design/Proposal from: ![MR-merged-environment-performance-1_Copy_53](/uploads/8431f0f649a07b5b150ad5924e47e222/MR-merged-environment-performance-1_Copy_53.png) to: - Revert and cherry-pick buttons will become smaller as they will be inline buttons by default - They will shift position to be behind the "merged" message. - They can remain their current position for mobile (if easily done) ![MR-merged-environment-performance-1_Copy_55](/uploads/aec3fb4c0d0352d7f9bee8a02a67de34/MR-merged-environment-performance-1_Copy_55.png) cc: @victorwu (making the https://gitlab.com/gitlab-org/gitlab-ce/issues/33095 more readable) @psimyn
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