fix(#2945): stack overflow on api.git.reload or fugitive event with watchers disabled (#2949)

* Reapply "refactor(#2871, #2886): multi instance: node classes created (#2916)"

This reverts commit 50e919426a.

* fix(#2945): stack overflow on api.git.reload or fugitive event

lua/nvim-tree/explorer/watch.lua

@@ -76,12 +76,7 @@ function M.create_watcher(node)
       else
         log.line("watcher", "node event executing refresh '%s'", node.absolute_path)
       end
-      local explorer = require("nvim-tree.core").get_explorer()
-      if explorer then
-        explorer:refresh_node(node, function()
-          explorer.renderer:draw()
-        end)
-      end
+      node:refresh()
     end)
   end