Query projects for simpl-sharp-targets

If the targeted project references the Simpl Sharp Targets packages, we simply need to use the msbuild CLI as the project will already run the dotnet simplsharp tool commands.

Start by tracing how this GitHub Action identifies targeted projects and invokes the msbuild CLI. Check how projects referencing Simpl Sharp Targets are handled alongside the existing dotnet simplsharp tool commands. Done means the targeted project path is queried and the appropriate build command runs without disrupting existing projects.

Written by the indexing model from the issue text.