Make a system note type distinguishable for showing different icon in frontend
Description
We are implementing the proposed design to make system note less intrusive in discussed issue #19797 (closed). According to the new design we need to show different icon based on the type of system note (i.e: commit, mentions, merge, labels) etc.
Proposal
We can add a system_note_type field to make it easily distinguishable.
or
Adds html wrapper for system note icon based on system note type in backend