chore: Move all integration tests to a single binary (#8093)

As per
https://matklad.github.io/2021/02/27/delete-cargo-integration-tests.html

Before that, there were 91 separate integration tests binary.

(As discussed on Discord — I've done the `uv` crate, there's still a few
more commits coming before this is mergeable, and I want to see how it
performs in CI and locally).

crates/uv-python/src/python_version/tests.rs

@@ -0,0 +1,32 @@
+use std::str::FromStr;
+
+use uv_pep440::{Prerelease, PrereleaseKind, Version};
+
+use crate::PythonVersion;
+
+#[test]
+fn python_markers() {
+    let version = PythonVersion::from_str("3.11.0").expect("valid python version");
+    assert_eq!(version.python_version(), Version::new([3, 11]));
+    assert_eq!(version.python_version().to_string(), "3.11");
+    assert_eq!(version.python_full_version(), Version::new([3, 11, 0]));
+    assert_eq!(version.python_full_version().to_string(), "3.11.0");
+
+    let version = PythonVersion::from_str("3.11").expect("valid python version");
+    assert_eq!(version.python_version(), Version::new([3, 11]));
+    assert_eq!(version.python_version().to_string(), "3.11");
+    assert_eq!(version.python_full_version(), Version::new([3, 11, 0]));
+    assert_eq!(version.python_full_version().to_string(), "3.11.0");
+
+    let version = PythonVersion::from_str("3.11.8a1").expect("valid python version");
+    assert_eq!(version.python_version(), Version::new([3, 11]));
+    assert_eq!(version.python_version().to_string(), "3.11");
+    assert_eq!(
+        version.python_full_version(),
+        Version::new([3, 11, 8]).with_pre(Some(Prerelease {
+            kind: PrereleaseKind::Alpha,
+            number: 1
+        }))
+    );
+    assert_eq!(version.python_full_version().to_string(), "3.11.8a1");
+}