[release-0.9] Test correct backend with examples tests

[christiangnrd]

Made against release-0.9 so tests will actually run.

Before:

From worker 2:	(backend, backend_str) = (KernelAbstractions.CPU(false), "oneAPI") # oneAPI
From worker 2:	(backend, backend_str) = (KernelAbstractions.CPU(false), "Metal") # Metal
From worker 2:	(backend, backend_str) = (CUDABackend(false, false), "CUDA") # CUDA
Succeeds? # AMD

After:

From worker 2:	(backend, backend_str) = (oneAPIBackend(), "oneAPI") # oneAPI
From worker 2:	(backend, backend_str) = (MetalBackend(), "Metal") # Metal
From worker 2:	(backend, backend_str) = (CUDABackend(false, false), "CUDA") # CUDA
Succeeds? # AMD

[christiangnrd]

Ok Seems like CUDA is still broken, I'll wait for that to be fixed. I don't understand the oneAPI failure in 1.11. Maybe it would be fixed on the main branch? However I can't test that easily.