What does this PR do?

This PR contains several minor fixes and improvements to increase the Testcontainers for .NET development experience. Some configurations are very strict. This makes it unnecessarily difficult for developers to set up their test environment. These changes will support more variety of configurations.

Why is it important?

• The ImageFromDockerfileConfiguration configuration did not work properly with file paths that contains backward slashes. Especially, on Windows machines backward slashes are common. Supporting backward slashes makes it more convenient for the developers to work with Testcontainesr for .NET.
• It adds the CLI commands to checkout and run the Weather Forecase example immediately. Developers do not need to enter the CLI commands manually anymore.
• It contains an improvement that may fix an issue with the Azurite configuration. Somehow, some Azurite containers response with the wrong service while the connection string is correct. This may relate to a wrong entrypoint.

Related issues

• Relates Can't create docker image for dotnet web api project #610
• Relates Azurite module unit test AzuriteTestcontainerTest.AllServicesEnabled.ConnectionEstablished fails #631