[MR Widget Eng] Document DRIs for each Widget

For the purpose of adding documentation to the handbook on who's directly resposible for each widget.

Widget UX issue Stage DRI
(Core) / Global Feature Flag Rollout &6647 (closed) groupcode review @iamphill
Accessibility #336180 (closed) ~"group::pipeline insights" @mfluharty
Browser performance #336179 (closed) ~"group::pipeline insights" @mfluharty
Code quality #336178 (closed) groupstatic analysis @jannik_lehmann
License compliance #336177 (closed) groupcomposition analysis @farias-gl
Metrics #336176 (closed) ~"group::pipeline insights" @mfluharty
Security #336175 (closed) groupthreat insights @svedova
Terraform #336174 (closed) ~"group::configure" @anna_vovchenko
Test summary #336173 (closed) ~"group::pipeline insights" @mfluharty
Status checks #336172 (closed) groupcompliance @jiaan
Load performance #336448 (closed) ~"group::pipeline insights" @mfluharty
Edited by Jannik Lehmann