Replace remove_dir_all with remove_virtualenv (#16203)

## Summary

Replace `remove_dir_all` with `remove_virtualenv` for the tool environment creation code path.

Closes #14985

## Test Plan

Relied on existing test coverage.

---------

Co-authored-by: Tomasz Kramkowski <tomasz@kramkow.ski>

crates/uv-tool/src/lib.rs

@@ -314,14 +314,14 @@ impl InstalledTools {
         let environment_path = self.tool_dir(name);
 
         // Remove any existing environment.
-        match fs_err::remove_dir_all(&environment_path) {
+        match remove_virtualenv(&environment_path) {
             Ok(()) => {
                 debug!(
                     "Removed existing environment for tool `{name}`: {}",
                     environment_path.user_display()
                 );
             }
-            Err(err) if err.kind() == io::ErrorKind::NotFound => (),
+            Err(uv_virtualenv::Error::Io(err)) if err.kind() == io::ErrorKind::NotFound => (),
             Err(err) => return Err(err.into()),
         }