sanitycheck: add an FSharpLint phase #2904

Job	Run time
macOS--dotnet6-only	59s
windows--dotnet6-and-legacyFramework	2m 15s
macOS--dotnet6-and-mono	5m 13s
macOS--mono-only	13m 56s
windows--legacyFramework-only	12m 18s
linux-github--dotnet-and-newmono	1m 47s
linux-github--dotnet-and-mono	46s
linux-vanilla--stockdotnet6-only	1m 6s
linux-vanilla--stockmono-only	4m 48s
windows--dotnet6-only	2m 14s
linux-vanilla--newmono-only	8m 3s
linux-vanilla--stockdotnet6-and-newmono	1m 54s
linux-vanilla--stockdotnet6-and-stockmono	2m 4s
conventions	0s
snap_pkg	0s
	57m 23s

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