Use premultiplied alpha for emoji rendering (#37370)

This improves emoji rendering on windows removing artifacts at the edges
by using premultiplied alpha. A bit more context can be found in #37167

Release Notes:

- N/A
60b95d9253localcc committed on 9/2/2025, 1:59:27 PM· committed by GitHubparent47ad1b2
2 files changedLine totals unavailable