ci: Migrate object storage service from MinIO to S3

On November 30th, the fd.o MinIO server will be unreachable, we now have the S3 instance located at https://s3.freedesktop.org. With this update, the CI will be able to succeed in December.

This commit series migrates the CI jobs to point to the new server, along with some dependencies:

• Hotfix piglit to have support for S3 server !19734 (ae273570)
• Updated ci-fairy
• Disable antichamber trace as the rest of the current fix for #7668 (closed) -> a090aa74
• Add Civ5 trace from a630-restricted to flake list 839b78f3

This branch had many merge conflicts, I was cautious with them, but I would appreciate a good code review to avoid making the stable branch unstable.