To fix the user tag control.
I would have done it locally to the user tag control, but it was pissing
me off because I wanted the add button to be aquamarine (as it's closer
to the accents the screen is already using), but the popover on open was
for whatever reason purple and I just want consistency where possible.
Band-aid fix for https://github.com/ppy/osu/issues/32671.
Removes all `BindableList.BindTo` from `load()` methods (except one
editor one which looks safe and is kinda hard to fix without moving
drawable load to a blocking operation).