WIP net8 unit tests #1781

Job	Run time
linux-oldLTS-github--dotnet-and-xbuild	9m 10s
macOS--dotnet6-and-mono	8m 58s
macOS--mono	5m 32s
linux-oldLTS-github--dotnet-and-msbuild	9m 16s
linux-newLTS-github--dotnet-and-msbuild	4m 32s
linux-newLTS-github--dotnet-and-xbuild	3m 51s
linux-newLTS-vanilla--newmono	5m 17s
linux-newLTS-vanilla--stockmono	4m 11s
linux-oldLTS-vanilla--newmono	5m 17s
linux-oldLTS-vanilla--stockmono	4m 37s
linux-newLTS-vanilla--dotnet8	3m 32s
windows--dotnet6	42s
windows--legacyFramework	12m 14s
sanity-check	0s
publish	0s
	1h 17m 9s

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