Remove dangling environments in tool uninstall (#4740)

## Summary

It seems useful that `tool uninstall` guarantees the tool is gone (e.g.,
if the receipt and environment get out-of-sync somehow).

crates/uv/src/commands/tool/uninstall.rs

@@ -25,7 +25,22 @@ pub(crate) async fn uninstall(
 
     let installed_tools = InstalledTools::from_settings()?;
     let Some(receipt) = installed_tools.get_tool_receipt(&name)? else {
-        bail!("Tool `{}` is not installed", name);
+        // If the tool is not installed, attempt to remove the environment anyway.
+        match installed_tools.remove_environment(&name) {
+            Ok(()) => {
+                writeln!(
+                    printer.stderr(),
+                    "Removed dangling environment for tool: `{name}` (missing receipt)"
+                )?;
+                return Ok(ExitStatus::Success);
+            }
+            Err(uv_tool::Error::IO(err)) if err.kind() == std::io::ErrorKind::NotFound => {
+                bail!("Tool `{name}` is not installed");
+            }
+            Err(err) => {
+                return Err(err.into());
+            }
+        }
     };
 
     // Remove the tool itself.

crates/uv/tests/tool_uninstall.rs

@@ -108,12 +108,12 @@ fn tool_uninstall_missing_receipt() {
     uv_snapshot!(context.filters(), context.tool_uninstall().arg("black")
         .env("UV_TOOL_DIR", tool_dir.as_os_str())
         .env("XDG_BIN_HOME", bin_dir.as_os_str()), @r###"
-    success: false
-    exit_code: 2
+    success: true
+    exit_code: 0
     ----- stdout -----
 
     ----- stderr -----
     warning: `uv tool uninstall` is experimental and may change without warning.
-    error: Tool `black` is not installed
+    Removed dangling environment for tool: `black` (missing receipt)
     "###);
 }