Update 16.8 insertion target (dotnet#9952)

Build Branch: release/dev16.7

Internal ID: fsharp-ci/20200711.3
Internal VS ID: rel.d16.7-30330.147

Merge pull request dotnet#9673 from dotnet/insert-16.7

update 16.7 VS insertion target

Merge pull request dotnet#9436 from dotnet/merges/master-to-release/d…

…ev16.7

Merge master to release/dev16.7

Build Branch: release/dev16.6

Internal ID: fsharp-ci/20200417.4
Internal VS ID: rel.d16.6-30114.105

Merge pull request dotnet#9185 from dotnet/merges/master-to-release/f…

…sharp5

Merge master to release/fsharp5

Merge pull request dotnet#8993 from dotnet/merges/master-to-release/f…

…sharp5

Merge master to release/fsharp5

Build Branch: release/dev16.5

Internal ID: fsharp-ci/20200331.6
Internal VS ID: rel.d16.5-30002.166

Merge pull request dotnet#8841 from dotnet/merges/master-to-release/f…

…sharp5

Merge master to release/fsharp5

Build Branch: release/dev16.5

Internal ID: fsharp-ci/20200204.8
Internal VS ID: rel.d16.5-29911.84