Move to Vulkan backend

Cf 9ada53ac

This should work on GNU/Linux too

Needed:

• Add the changes for Linux,
• test with libqt-jami on snap/debian/ubuntu18/ubuntu20/ubuntu21/fedora

changed milestone to %Backlog

added media + 1 deleted label

added SprintTo review label

https://review.jami.net/c/jami-client-qt/+/20142

removed SprintTo review label

mentioned in commit 8e2d600f

closed

added severitylow label