Remove `block_mouse_down` in favor of `stop_mouse_events_except_scroll` (#30401)

This method was added in #20649 to be an alternative of `occlude` which
allows scroll events. It seems a bit arbitrary to only stop left mouse
downs, so this seems like it's probably an improvement.

Release Notes:

- N/A
8aef64bbfaMichael Sloan committed on 5/29/2025, 10:07:34 PM· committed by GitHubparent9086784
6 files changedLine totals unavailable