[BUG] Missing Fable file includes

[Freymaurer]

• [x] https://github.com/nfdi4plants/ARCtrl/blob/main/src/Contract/ARCtrl.Contract.fsproj
• [x] https://github.com/nfdi4plants/ARCtrl/blob/main/src/FileSystem/ARCtrl.FileSystem.fsproj
• [x] https://github.com/nfdi4plants/ARCtrl/blob/main/src/Core/ARCtrl.Core.fsproj
• [x] https://github.com/nfdi4plants/ARCtrl/blob/main/src/Spreadsheet/ARCtrl.Spreadsheet.fsproj

[Freymaurer]

Please fix asap 😢