`pixi-build` with `exclude-newer` results in multiple builds after consecutive `pixi install`s

[pavelzw]

this regression test is currently failing on main

fn count_build_events(events: &[BackendEvent]) -> usize {
    events
        .iter()
        .filter(|event| matches!(event, BackendEvent::CondaBuildV1Called))
        .count()
}

#[tokio::test]
async fn install_with_relative_exclude_newer_does_not_rebuild_unchanged_source_packages() {
    setup_tracing();

    let (instantiator, mut observer) =
        ObservableBackend::instantiator(PassthroughBackend::instantiator());
    let backend_override = BackendOverride::from_memory(instantiator);
    let pixi = PixiControl::new()
        .unwrap()
        .with_backend_override(backend_override);

    let source_dir = pixi.workspace_path().join("my-package");
    fs_err::create_dir_all(&source_dir).unwrap();

    fs_err::write(
        source_dir.join("pixi.toml"),
        r#"
[package]
name = "my-package"
version = "0.0.0"

[package.build]
backend = { name = "in-memory", version = "0.1.0" }
"#,
    )
    .unwrap();

    fs_err::write(
        pixi.manifest_path(),
        format!(
            r#"
[workspace]
name = "my-package"
channels = []
# exclude-newer = "7d"
platforms = ["{}"]
preview = ["pixi-build"]

[dependencies]
my-package = {{ path = "./my-package" }}
"#,
            Platform::current()
        ),
    )
    .unwrap();

    pixi.install().await.unwrap();
    let first_build_events = observer.events();
    assert_eq!(
        count_build_events(&first_build_events),
        1,
        "first install should build the source package once"
    );

    tokio::time::sleep(Duration::from_millis(10)).await;

    pixi.install().await.unwrap();
    let second_build_events = observer.events();
    assert_eq!(
        count_build_events(&second_build_events),
        0,
        "second install should reuse the existing build cache for an unchanged source package"
    );
}