patch 8.2.2371: Vim9: crash when using types in :for with unpack

Problem:    Vim9: crash when using types in :for with unpack.
Solution:   Check for skip_var_list() failing. Pass include_type to
            skip_var_one(). Skip type when compiling. (closes #7694)

src/testdir/test_vim9_script.vim

@@ -2060,6 +2060,12 @@ def Test_for_loop()
     total += nr
   endfor
   assert_equal(6, total)
+
+  var res = ""
+  for [n: number, s: string] in [[1, 'a'], [2, 'b']]
+    res ..= n .. s
+  endfor
+  assert_equal('1a2b', res)
 enddef
 
 def Test_for_loop_fails()