Golden Army eventually wins. They repair from being brought down to raw materials like nuts and bolts, so it doesn't matter how much the Wakandans pummel them or shoot vibranium energy blasters at them. They'll keep repairing and eventually wipe out their entire military.
Your math is off. Each individual soldier is made of thousands of clockwork parts. And there's 4900 soldiers. If we lowball and say each one has 1,000 parts, thats a total of 4,900,000 pieces. I dont even think the population of Wakanda is anywhere near that high. And if it is it includes non-combatabts like women and children and the elderly.
And this is ignoring the not broken clockworks still stabbing everything up.
You're acting like the Wakandans are a bunch of idiots. Obviously they won't approach a golden soldier while it's active, they'll blast it first till it's down then grab parts. And obviously you don't need to grab every single part, just concentrate on the important pieces like the head or maybe legs, knees, joints etc. And if you can only go through a number of them before they reassemble, then step back and blast them again. Rinse and repeat.
And even if that doesn't work, I still haven't heard anything to counter simply driving them into a pit.