Fix rm path handling (#11064)

# Description
Fixes issue #11061 where `rm` fails to find a file after a `cd`. It
looks like the new glob functions do not return absolute file paths
which we forgot to account for.

# Tests
Added a test (fails on current main, but passes with this PR).

---------

Co-authored-by: Jakub Žádník <kubouch@gmail.com>

crates/nu-command/tests/commands/rm.rs

@@ -375,6 +375,21 @@ fn removes_symlink() {
     });
 }
 
+#[test]
+fn removes_file_after_cd() {
+    Playground::setup("rm_after_cd", |dirs, sandbox| {
+        sandbox.with_files(vec![EmptyFile("delete.txt")]);
+
+        nu!(
+            cwd: dirs.root(),
+            "let file = 'delete.txt'; cd rm_after_cd; rm $file",
+        );
+
+        let path = dirs.test().join("delete.txt");
+        assert!(!path.exists());
+    })
+}
+
 struct Cleanup<'a> {
     dir_to_clean: &'a Path,
 }