Fix try: Add set_last_error() to prepare_error_handler() for IR eval (#13838)

# Description

Fixes a bug with `set_last_error()` introduced by @IanManske not being
called during the jump to an error handler in IR eval. Without this,
`$env.LAST_EXIT_CODE` wasn't getting set in the `catch` block for an
external.

# Tests + Formatting

Added a `tests/eval` test to cover this in both IR and non-IR eval

crates/nu-engine/src/eval_ir.rs

@@ -246,6 +246,8 @@ fn prepare_error_handler(
 ) {
     if let Some(reg_id) = error_handler.error_register {
         if let Some(error) = error {
+            // Stack state has to be updated for stuff like LAST_EXIT_CODE
+            ctx.stack.set_last_error(&error.item);
             // Create the error value and put it in the register
             ctx.put_reg(
                 reg_id,

tests/eval/mod.rs

@@ -451,6 +451,14 @@ fn try_catch_with_non_literal_closure() {
     )
 }
 
+#[test]
+fn try_catch_external() {
+    test_eval(
+        r#"try { nu -c 'exit 1' } catch { $env.LAST_EXIT_CODE }"#,
+        Eq("1"),
+    )
+}
+
 #[test]
 fn row_condition() {
     test_eval(