Tools,Fsdk: move prerelease version gen to Fsdk #1619

Job	Run time
linux-newLTS-vanilla--dotnet6	49s
linux-newLTS-vanilla--newmono	1m 13s
linux-newLTS-github--dotnet-and-xbuild	23s
linux-newLTS-github--dotnet-and-msbuild	36s
linux-newLTS-vanilla--stockmono	47s
linux-oldLTS-github--dotnet-and-xbuild	43s
linux-oldLTS-github--dotnet-and-msbuild	33s
linux-oldLTS-vanilla--newmono	1m 25s
linux-oldLTS-vanilla--stockmono	1m 9s
macOS--dotnet6-and-mono	36s
macOS--mono	21s
windows--dotnet6	1m 9s
windows--legacyFramework	2m 11s
sanity-check	0s
publish	0s
	11m 55s

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