feat: Enable .slnx solutions to be analyzed #1398

Job	Run time
Build warnings check	22s
Tests for .net core net8.0 on ubuntu-latest	44s
Tests for .net core net9.0 on ubuntu-latest	45s
Tests for .net core net8.0 on windows-latest	2m 53s
Tests for .net core net9.0 on windows-latest	2m 25s
Tests for .net core net8.0 on macos-latest	47s
Tests for .net core net9.0 on macos-latest	46s
	8m 42s

Provide feedback