don't include import path in args to aliased external commands (nushell#14231)

Fixes nushell#13776

# User-Facing Changes

Arguments to aliased externals no longer include nested import paths:

```diff
module foo { export alias bar = ^echo }
use foo
foo bar baz
-bar baz
+baz
```

Author: sgvictorino

crates/nu-parser/src/parser.rs

@@ -1343,10 +1343,10 @@ pub fn parse_call(working_set: &mut StateWorkingSet, spans: &[Span], head: Span)
                 trace!("parsing: alias of external call");
 
                 let mut head = head.clone();
-                head.span = spans[0]; // replacing the spans preserves syntax highlighting
+                head.span = Span::concat(&spans[cmd_start..pos]); // replacing the spans preserves syntax highlighting
 
                 let mut final_args = args.clone().into_vec();
-                for arg_span in &spans[1..] {
+                for arg_span in &spans[pos..] {
                     let arg = parse_external_arg(working_set, *arg_span);
                     final_args.push(arg);
                 }

tests/modules/mod.rs

@@ -2,6 +2,7 @@ use nu_test_support::fs::Stub::{FileWithContent, FileWithContentToBeTrimmed};
 use nu_test_support::playground::Playground;
 use nu_test_support::{nu, nu_repl_code};
 use pretty_assertions::assert_eq;
+use rstest::rstest;
 
 #[test]
 fn module_private_import_decl() {
@@ -612,6 +613,29 @@ fn deep_import_patterns() {
     assert_eq!(actual.out, "foo");
 }
 
+#[rstest]
+fn deep_import_aliased_external_args(
+    #[values(
+        "use spam; spam eggs beans foo bar",
+        "use spam eggs; eggs beans foo bar",
+        "use spam eggs beans; beans foo bar",
+        "use spam eggs beans foo; foo bar"
+    )]
+    input: &str,
+) {
+    let module_decl = "
+        module spam {
+            export module eggs {
+                export module beans {
+                    export alias foo = ^echo
+                }
+            }
+        }
+    ";
+    let actual = nu!(format!("{module_decl}; {input}"));
+    assert_eq!(actual.out, "bar");
+}
+
 #[test]
 fn module_dir() {
     let import = "use samples/spam";