vim-patch:9.0.2131: not all nushell files detected (#26260)

Problem:  not all nushell files detected
Solution: use *.nu to detect nushell files

closes: vim/vim#13586

b9efc72c24

Co-authored-by: Daniel Buch Hansen <boogiewasthere@gmail.com>

runtime/lua/vim/filetype.lua

@@ -716,6 +716,7 @@ local extension = {
   tr = 'nroff',
   nsi = 'nsis',
   nsh = 'nsis',
+  nu = 'nu',
   obj = 'obj',
   objdump = 'objdump',
   cppobjdump = 'objdump',
@@ -1387,8 +1388,6 @@ local filename = {
   Neomuttrc = 'neomuttrc',
   ['.netrc'] = 'netrc',
   NEWS = detect.news,
-  ['env.nu'] = 'nu',
-  ['config.nu'] = 'nu',
   ['.ocamlinit'] = 'ocaml',
   ['.octaverc'] = 'octave',
   octaverc = 'octave',

test/old/testdir/test_filetype.vim

@@ -454,7 +454,7 @@ func s:GetFilenameChecks() abort
     \ 'nqc': ['file.nqc'],
     \ 'nroff': ['file.tr', 'file.nr', 'file.roff', 'file.tmac', 'file.mom', 'tmac.file'],
     \ 'nsis': ['file.nsi', 'file.nsh'],
-    \ 'nu': ['env.nu', 'config.nu'],
+    \ 'nu': ['file.nu'],
     \ 'obj': ['file.obj'],
     \ 'objdump': ['file.objdump', 'file.cppobjdump'],
     \ 'obse': ['file.obl', 'file.obse', 'file.oblivion', 'file.obscript'],