tests: add gpu-driver-sensitive label

Tests labeled with gpu-driver-sensitive may need to be executed on
different machines with different (physical) GPUs. They may not provide
full test coverage on CI or virtual machines.

Change-Id: Iaae07ecc1688114bbd04c7a40a36c221e1768df3
Reviewed-by: Mikko Hallamaa <mikko.hallamaa@qt.io>