ENG-1193: add left sidebar feature flag#638

sid597 wants to merge 2 commits intoeng-1191-feature-flag-blockpropfeatureflagpaneltsxDiscourseGraphs/discourse-graph:eng-1191-feature-flag-blockpropfeatureflagpaneltsxfrom

eng-1193-feature-flag-left-sidebarDiscourseGraphs/discourse-graph:eng-1193-feature-flag-left-sidebarCopy head branch name to clipboard