Tools,Fsdk: move prerelease version gen to Fsdk #1620

Job	Run time
linux-newLTS-vanilla--dotnet6	34s
linux-newLTS-vanilla--newmono	1m 19s
linux-newLTS-github--dotnet-and-xbuild	25s
linux-newLTS-github--dotnet-and-msbuild	34s
linux-newLTS-vanilla--stockmono	1m 8s
linux-oldLTS-github--dotnet-and-msbuild	36s
linux-oldLTS-github--dotnet-and-xbuild	20s
linux-oldLTS-vanilla--newmono	1m 31s
linux-oldLTS-vanilla--stockmono	1m 13s
macOS--dotnet6-and-mono	37s
macOS--mono	26s
windows--dotnet6	36s
windows--legacyFramework	5m 22s
sanity-check	0s
publish	0s
	14m 41s

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