vim-patch:partial:9.1.0027: Vim is missing a foreach() func (#27037)

Problem:  Vim is missing a foreach() func
Solution: Implement foreach({expr1}, {expr2}) function,
          which applies {expr2} for each item in {expr1}
          without changing it (Ernie Rael)

closes: vim/vim#12166

e79e207760

Partial port as this doesn't handle non-materialized range() lists.

vim-patch:c92b8bed1fa6

runtime(help): delete duplicate help tag E741 (vim/vim#13861)

c92b8bed1f

Co-authored-by: Ernie Rael <errael@raelity.com>

test/old/testdir/vim9.vim

@@ -2,6 +2,10 @@
 " Use a different file name for each run.
 let s:sequence = 1
 
+func CheckDefSuccess(lines)
+  return
+endfunc
+
 func CheckDefFailure(lines, error, lnum = -3)
   return
 endfunc