Hole in fork crown welding seam
That's just a poor weld. Notice there are other deliberately drilled holes in that area so an extra one is not a problem.

Clicking in the headset area is much more likely to be flex between the steerer and stem, stem and bars, or possibly the headset races pressed into the frame. If the click happens as you go over a bump or change force on the bars through pedal strokes that would point to those interfaces as a culprit.