fix(osx): deprecate `osx` plugin without symlink (#10428)

Fixes #10428

plugins/macos/macos.plugin.zsh

-# Check if 'osx' is still in the plugins list and prompt to change to 'macos'
-if [[ -n "${plugins[(r)osx]}" ]]; then
-  print ${(%):-"%F{yellow}The \`osx\` plugin is deprecated and has been renamed to \`macos\`."}
-  print ${(%):-"Please update your .zshrc to use the \`%Bmacos%b\` plugin instead.%f"}
-fi
-
 # Open the current directory in a Finder window
 alias ofd='open_command $PWD'
 

plugins/macos/osx.plugin.zsh

-macos.plugin.zsh
\ No newline at end of file

plugins/osx

-macos
\ No newline at end of file

plugins/osx/README.md

+# osx plugin
+
+**Deprecated: use the [`macos`](https://github.com/ohmyzsh/ohmyzsh/tree/master/plugins/macos) plugin instead.**

plugins/osx/osx.plugin.zsh

+print ${(%):-'%F{yellow}The `osx` plugin is deprecated and has been renamed to `macos`.'}
+print ${(%):-'Please update your .zshrc to use the `%Bmacos%b` plugin instead.%f'}
+
+(( ${fpath[(Ie)$ZSH/plugins/macos]} )) || fpath=("$ZSH/plugins/macos" $fpath)
+source "$ZSH/plugins/macos/macos.plugin.zsh"