Can Winds of Qal Sisma trigger Willbreaker's ability?
No. Willbreaker triggers specifically when something "...becomes the target of a spell or ability...". Spells and abilities only target if they say "target" (or if they're an aura being cast). Winds of Qal Sisma doesn't say "target", it just prevents all combat damage, regardless of where it came from, so Willbreaker never sees anything that'd cause it to trigger.