Update project::update_environment to respect reinstall options (#4502

)

While working on #4492 I noticed
that `--reinstall-package` was not actually respected by
`update_environment`, it exited early due to satisfied requirements.

Before

```

❯ cargo run -q -- tool install black -v --reinstall-package tomli
...
DEBUG All requirements satisfied: black | click>=8.0.0 | mypy-extensions>=0.4.3 | packaging>=22.0 | pathspec>=0.9.0 | platformdirs>=2 | tomli>=1.1.0 ; python_version < '3.11' | typing-extensions>=4.0.1 ; python_version < '3.11'
```

After

```
❯ cargo run -q -- tool install black -v --reinstall-package tomli
...
Uninstalled 1 package in 0.99ms
Installed 1 package in 4ms
 - tomli==2.0.1
 + tomli==2.0.1
```

crates/uv/src/commands/project/mod.rs

@@ -319,7 +319,7 @@ pub(crate) async fn update_environment(
 
     // Check if the current environment satisfies the requirements
     let site_packages = SitePackages::from_environment(&venv)?;
-    if spec.source_trees.is_empty() {
+    if spec.source_trees.is_empty() && reinstall.is_none() {
         match site_packages.satisfies(&spec.requirements, &spec.constraints)? {
             // If the requirements are already satisfied, we're done.
             SatisfiesResult::Fresh {