vim-patch:9.1.0245: filetype: zsh theme, history and zunit files are not recognized

Problem:  filetype: zsh theme, history and zunit files are not
          recognized.
Solution: Detect '.zsh_history', '*.zsh-theme' and '*.zunit' as zsh
          (Wu, Zhenyu)

closes: vim/vim#14366

vim/vim@a55a22a

Co-authored-by: Wu, Zhenyu <[email protected]>

Author: clason

runtime/lua/vim/filetype.lua

@@ -1155,6 +1155,8 @@ local extension = {
   zut = 'zimbutempl',
   zs = 'zserio',
   zsh = 'zsh',
+  zunit = 'zsh',
+  ['zsh-theme'] = 'zsh',
   vala = 'vala',
   web = detect.web,
   pl = detect.pl,
@@ -1573,6 +1575,7 @@ local filename = {
   ['.zshrc'] = 'zsh',
   ['.zprofile'] = 'zsh',
   ['.zcompdump'] = 'zsh',
+  ['.zsh_history'] = 'zsh',
   ['.zshenv'] = 'zsh',
   ['.zfbfmarks'] = 'zsh',
   -- END FILENAME

test/old/testdir/test_filetype.vim

@@ -750,8 +750,7 @@ func s:GetFilenameChecks() abort
     \ 'zimbu': ['file.zu'],
     \ 'zimbutempl': ['file.zut'],
     \ 'zserio': ['file.zs'],
-    \ 'zsh': ['.zprofile', '/etc/zprofile', '.zfbfmarks', 'file.zsh', '.zcompdump', '.zlogin', '.zlogout', '.zshenv', '.zshrc', '.zcompdump-file', '.zlog', '.zlog-file', '.zsh', '.zsh-file', 'any/etc/zprofile', 'zlog', 'zlog-file', 'zsh', 'zsh-file'],
-    \
+    \ 'zsh': ['.zprofile', '/etc/zprofile', '.zfbfmarks', 'file.zsh', 'file.zsh-theme', 'file.zunit', '.zcompdump', '.zlogin', '.zlogout', '.zshenv', '.zshrc', '.zsh_history', '.zcompdump-file', '.zlog', '.zlog-file', '.zsh', '.zsh-file', 'any/etc/zprofile', 'zlog', 'zlog-file', 'zsh', 'zsh-file'],
     \ 'help': [$VIMRUNTIME . '/doc/help.txt'],
     \ }
 endfunc