fix(progress): show progress-status only in curwin #38458

Problem:
Currently same progress stat get's displayed on statusline of all
windows. This is repeatitive and noisy.

Solultion:
Only display progress-status on the focused window

Problem:
Currently, when multiple progress are on going we show it as Progress:
{N} items {percent}% format. It can be simplified sinnce items doesn't
really add enough value for the valuable space it takes in statusline

Solution:
Change format to Progress: {percent}%({N})

runtime/lua/vim/ui.lua

@@ -352,7 +352,7 @@ do
   --- Gets a status description summarizing currently running progress messages.
   --- - If none: returns empty string
   --- - If one running item: "title: 42%"
-  --- - If multiple running items: "Progress: N items AVG%"
+  --- - If multiple running items: "Progress: AVG%(N)"
   ---@param running ProgressMessage[]
   ---@return string
   local function progress_status_fmt(running)
@@ -371,7 +371,7 @@ do
         sum = sum + (progress_item.percent or 0)
       end
       local avg = math.floor(sum / count)
-      return string.format('Progress: %d items %d%%%% ', count, avg)
+      return string.format('Progress: %d%%%%(%d) ', avg, count)
     end
   end