Building before a debugging session was restarted

[basvandriel]

Background

Resolves #17901. It adds support for rebuilding after debugging a test was restarted. This means the test doesn't have to be aborted and manually re-ran again.

How this is tested

First, all the Visual Studio Code extensions are loaded into an Extension Host window. Then, a sample test like below was ran and restarted to see if it was correctly rebuild.

#[test]
fn test_x() {
    assert_eq!("1.1.1", "1.1.0");
}