dotnet: fixup cleaning
dotnet: fixup cleaning

- remove OrTools.csproj and OrTools.FSharp.fsproj

google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,or-tools/or-tools,or-tools/or-tools,google/or-tools,google/or-tools,or-tools/or-tools