feat: show ahead and behind commits in winbar

lua/gitlab/actions/discussions/init.lua

@@ -55,6 +55,9 @@ end
 ---Makes API call to get the discussion data, stores it in the state, and calls the callback
 ---@param callback function|nil
 M.load_discussions = function(callback)
+  local git = require("gitlab.git")
+  local ahead, behind = git.get_ahead_behind(git.get_current_branch(), git.get_remote_branch())
+  state.ahead_behind = { ahead, behind }
   state.discussion_tree.last_updated = nil
   state.load_new_state("discussion_data", function(data)
     if not state.DISCUSSION_DATA then