brew plugin completion is not working.

[marknefedov]

Describe the bug

See title.

Steps to reproduce

Enable brew plugin
type brew
press tab
Folder is suggested
run compinit
type brew
press tab
brew completion appears

Expected behavior

proper completion init

Screenshots and recordings

Screenshot.2024-01-26.at.19.34.51.mp4

OS / Linux distribution

macOS 14.3

Zsh version

5.9

Terminal emulator

macOS terminal

If using WSL on Windows, which version of WSL

None

Additional context

It looks like Oh my zsh initialized completion before brew plugin sets up a completion.
Doing as in #12024 fixes problem, but them plugin double adds path to fpath.
We need either to remove fpath addition from plugin or fix initialization order.

ohmyzsh/plugins/brew/brew.plugin.zsh

Lines 26 to 35 in 80c114c

	if [[ -z "$HOMEBREW_PREFIX" ]]; then
	# Maintain compatability with potential custom user profiles, where we had
	# previously relied on always sourcing shellenv. OMZ plugins should not rely
	# on this to be defined due to out of order processing.
	export HOMEBREW_PREFIX="$(brew --prefix)"
	fi
	if [[ -d "$HOMEBREW_PREFIX/share/zsh/site-functions" ]]; then
	fpath+=("$HOMEBREW_PREFIX/share/zsh/site-functions")
	fi