you should not install the Fedora package but the package from build.opensuse.org
https://software.opensuse.org/download.html?project=graphics:darktable&package=darktable
fedora is under unknown.
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Thanks, it also worked. 
The OpenCL problem persists and I still don’t know what the solution is, or if there is a solution.
Since your log says
0.096445 [opencl_init] discarding device 0 'gfx902:xnack+' due to insufficient global memory (512MB).
I think it’s quite clear that Darkktable refuses your APU because it can not access more than 512Mb of memory; whatever the driver you have.
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Sorry for the incredible late response.
I managed to enable OpenCL, but darktable’s performance was bad. Now, I’m using darktable without OpenCL.
How did you manage to do that? I’ve bought a second SSD to have Windows on one of them and Linux on the other. My choice was Fedora 35 and I tried regular install from GNOME Software Manager (RPM package) and from build.opensuse - in both cases opencl in preferences is grayed out.
I’ve also installed packages for opencl & headers, still no luck.
My GPU is Gigabyte GTX 1050 Ti G1, Nvidia’s proprietary 510 drivers.
The same version of drivers and darkatble (3.8.1) under Windows work like a charm.