Tools,Fsdk: move prerelease version gen to Fsdk #1621

Job	Run time
macOS--dotnet6-and-mono	34s
linux-oldLTS-github--dotnet-and-xbuild	37s
linux-oldLTS-github--dotnet-and-msbuild	34s
macOS--mono	42s
linux-newLTS-github--dotnet-and-msbuild	32s
linux-newLTS-github--dotnet-and-xbuild	25s
linux-oldLTS-vanilla--newmono	1m 29s
linux-newLTS-vanilla--dotnet6	33s
linux-newLTS-vanilla--newmono	1m 22s
linux-newLTS-vanilla--stockmono	49s
linux-oldLTS-vanilla--stockmono	49s
windows--dotnet6	48s
windows--legacyFramework	5m 55s
sanity-check	0s
publish	0s
	15m 9s

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