build: fix build when repo path includes spaces

[Dave-Robertson92]

Cloning solution into folder with spaces in the path

Purpose

Allow the clone solution into folder with spaces in the path

Approach

replace line: <Exec Command="dotnet build %(SolutionProjectsToBuild.FullPath) --configuration $(Configuration)" /> with <Exec Command="dotnet build "%(SolutionProjectsToBuild.FullPath)" --configuration $(Configuration)" />